Scene documentation lab
Safety gate · before any work
- Treat all biological trace samples (hair, fiber) as potentially hazardous: wear gloves when handling and do not touch your face.
- Used forceps must be placed in the designated container between uses; never lay them on the table surface.
- Microscope slides are glass: handle with care; report any breakage immediately and use the sharps disposal container.
Do now
Document a mock crime scene to SOP standard and examine trace evidence under magnification with a team.
- Hand in
- Team scene packet: one photo with scale marker, scaled sketch with orientation, completed evidence log, microscopy sketch at two magnifications, and one contamination risk noted.
- Where
- Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
You get two school days for every day you were absent, so this deadline moves with you.
Your team has ten minutes to document a mock scene and lift one fiber. If the photographer forgets the scale marker, does the sketcher's perfect drawing still hold up?
Document a mock crime scene to SOP standard and examine under magnification with a team.
- • I can document a scene following an SOP with my team.
- • I can describe observed under magnification.
- Name two things that must appear in every scene photograph so the image can be measured later.
- Why do you record the microscope magnification next to any sketch you make of a fiber or hair?
- 1Read the scene SOP and assign roles: photographer, sketcher, logger.
- 2Photograph and sketch the scene with a scale marker and orientation note.
- 3Collect and label , recording each item in the evidence log.
- 4Examine a trace sample (fiber or hair) under magnification and describe it.
- 5Record one limitation of your documentation and one possible source.
What did this day actually feel like?
Scene documentation lab
TEAM LAB Mock crime scene, and this one was a genuine team job with assigned roles. Photographer, sketcher, logger. I was the logger, which sounded like the boring one and turned out to be the one everybody depends on, because if the log does not match the photographs then none of it holds together.
We had a problem. Our photographer shot the whole scene before our sketcher had set the scale marker, so the first set of photos had no reference for size. We did not catch it until the sketch did not match. We had to decide whether to reshoot, which meant admitting we had already disturbed the scene, or note the limitation honestly in the log. We reshot and logged both, which took most of the period and meant our packet was rushed.
Mr. Mendoza said that was the most useful mistake in the room, because the fix was not better photography, it was talking to each other before starting. We had three people working in parallel and nobody sequencing.
Turned in: team scene packet → Lab Reports folder, with each of our roles on the cover
Fiction. There is no such student. The lessons, labs and dates are the real planned course; the student, the classmates and the conversations are invented.
The same day, drawn.
I was the logger. It sounded like the boring job. Then our photographer shot the whole scene before the scale marker was set, and the sketch did not match.
Fiction. There is no such student. The lessons, labs and dates are the real planned course; the student, the classmates and the conversations are invented.
🛠 Get unstuck · pick your level
Lab day: Tier 1 is the whole class at the bench. No extension today.
🔑 Today's words · 5
Tap a word in the lesson for a plain meaning and one example. Recycled into next week's Do-Now.
Do the work · 80-minute blockfirst 5 min = hook▸
💡 Big idea: Scene documentation works only as a team SOP, because a missing scale marker, unlogged item, or unrecorded magnification anywhere breaks the chain and weakens everyone's evidence.
- 0:00Assign or confirm roles; review scene SOP as a class; set expectations for handling
- 0:10Scene documentation: teams photograph and sketch scene (do not touch items yet)
- 0:25Evidence collection: log each item, bag, and seal with team signatures on custody label
- 0:40Microscopy station: examine assigned trace sample; sketch at 40x and 100x with magnification labeled
- 1:00Record one documentation limitation and one risk in lab notebook
- 1:10Scene packet review as a class; preview Thursday analysis
- • You have your roles assigned from Tuesday. Today is the real thing: a mock scene is set up in the room, and your team has exactly 15 minutes to document it correctly before collection begins.
- • Your photographer cannot move a single item. Your sketcher must include a scale marker and mark which direction is north. Your logger must fill in every field on the evidence log before the collector bags anything.
- • We will also get our first look at under the microscope. Trace evidence is the invisible record left behind at every scene, and the only way to see it is magnification.
- • Remember: if you skip a step in the SOP, it is not just a grade issue. In a real case, that evidence might not be usable.
- • Scale markers (rulers) and orientation notes (compass direction, room label) must appear in every scene photograph.
- • such as fibers and hair is collected with forceps into labeled, sealed bags and logged immediately on the evidence form.
- • Microscope magnification must be recorded with any sketch or observation so that scale can be interpreted later.
Unit 1.1 Investigating the Scene: Forensic scene documentation, evidence log, crime-scene sketch, trace evidence, biometric data. · Scene documentation lab
Day 3 of this lesson. Open this exact section in myPLTW (find it in Clever, Microsoft sign-in), then do the work below.
Do this: Open myPLTW and locate the Lesson 1.1 Investigating the Scene scene-documentation activity. Record your team roles and case number in the activity log.
Mark the Lesson 1.1 scene-documentation activity started and log your role in myPLTW.
You completed the evidence-log task Tuesday. Today your team's full scene packet (photos, sketch, evidence log) should be done before leaving.
Submitted scene packet including a photo with scale marker, a labeled sketch, and a completed evidence log.
The official PLTW activity stays inside myPLTW. If myPLTW will not open, use F1 and E1-E3 on this page to complete today's local evidence decision, then make up the official activity when access returns. Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
Check things off as you work, then submit. This tells Mr. Mendoza how you're doing so he can help the class. It does not replace turning in your producible through the submission route shown below.
Use the code Mr. Mendoza gave you, not your name. Saved on this device.
Unit 1.1 Investigating the Scene: Forensic scene documentation, evidence log, crime-scene sketch, trace evidence, biometric data. · Scene documentation lab
Open myPLTW and locate the Lesson 1.1 Investigating the Scene scene-documentation activity. Record your team roles and case number in the activity log.
You completed the evidence-log task Tuesday. Today your team's full scene packet (photos, sketch, evidence log) should be done before leaving.
This is how Mr. Mendoza sees the class keeping pace with PLTW. Be honest, it only helps if it is accurate.
🎯 Document a mock crime scene to SOP standard and examine under magnification with a team.
- Read the scene SOP and assign roles: photographer, sketcher, logger.
- Photograph and sketch the scene with a scale marker and orientation note.
- Collect and label , recording each item in the evidence log.
- Examine a trace sample (fiber or hair) under magnification and describe it.
- Record one limitation of your documentation and one possible source.
Lab report: Team scene packet: one photo with scale marker, scaled sketch with orientation, completed evidence log, microscopy sketch at two magnifications, and one risk noted.
Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not. Use the checklist just below and upload by 11:29 PM for full credit. Absent with an excused absence? You get two school days for every day you were absent, so this deadline moves with you.
| Task | Who |
|---|---|
| Read the scene SOP and assign roles: photographer, sketcher, logger. | _______ |
| Photograph and sketch the scene with a scale marker and orientation note. | _______ |
| Collect and label , recording each item in the evidence log. | _______ |
| Examine a trace sample (fiber or hair) under magnification and describe it. | _______ |
| Record one limitation of your documentation and one possible source. | _______ |
Working solo? Put your own name in "Who" for every row.
- I can document a scene following an SOP with my team.
- I can describe observed under magnification.
- 1Do thisDocument a mock crime scene to SOP standard and examine trace evidence under magnification with a team.
- 2Use this resource
- 3Submit thisLab report: Team scene packet: one photo with scale marker, scaled sketch with orientation, completed evidence log, microscopy sketch at two magnifications, and one contamination risk noted.
- 4Submit it here
- 1Open the drop folder.
- 2Sign in with your district Microsoft account, not a personal one.
- 3Upload the file, named Lastname_Firstname__Assignment Title.
- 4Your own upload panel says Uploaded with a green check: that is your receipt.
Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not. Principles of Biomedical Technology (Principles of Biomedical Science) › Unit 1.1 Investigating the Scene: Forensic scene documentation, evidence log, crime-scene sketch, trace evidence, biometric data. › Lab reportOpen the drop folder
Learn it · deck, reading, and vocabulary▸
The deck carries the prior idea forward, lets you inspect an analogy, maps the rule to biology, and ends with the same evidence decision and exit ticket used on this page.
Generated from this lesson's canonical data with a red-team citation check.
In science documentation is the evidence, because a record that is unsigned, undated, or out of sequence cannot be verified, so no documentation means no case.
Scene documentation works only as a team SOP, because a missing scale marker, unlogged item, or unrecorded magnification anywhere breaks the chain and weakens everyone's evidence.
A detective board holds observations, possible explanations, and one next question.
- Which notes are direct observations?
- Which notes are explanations?
- What new evidence would separate the explanations?
Keep observations separate from explanations, then collect the evidence that can distinguish the options.
Biomedical investigations use controlled procedures and validated measurements, not intuition alone.
- • Board notes map to E1-E3.
- • Possible explanations map to the decision options.
- • The next question maps to the evidence-based action.
Driving question: Your team has ten minutes to document a mock scene and lift one fiber. If the photographer forgets the scale marker, does the sketcher's perfect drawing still hold up?
What you already know: In science documentation is the evidence, because a record that is unsigned, undated, or out of sequence cannot be verified, so no documentation means no case.
New idea: Scene documentation works only as a team SOP, because a missing scale marker, unlogged item, or unrecorded magnification anywhere breaks the chain and weakens everyone's evidence.
Visual or model: F1. F1. A lesson illustration or teaching diagram for Scene documentation lab. Use it with E1-E3; it is a model or context image, not experimental or patient data. What to notice: Trace the labeled observation or evidence sequence before choosing an explanation.
- Observe or measure the relevant feature in Scene documentation lab.
- Organize the observation with a stable evidence ID.
- Apply this rule: Keep observations separate from explanations, then collect the evidence that can distinguish the options.
- Choose the option the evidence supports and state the limit of the conclusion.
Real biomedical example: Your team has ten minutes to document a mock scene and lift one fiber. If the photographer forgets the scale marker, does the sketcher's perfect drawing still hold up?
What the evidence supports: E1-E3 and F1 support the daily take-home when the response meets the stated success criteria.
What it cannot prove: The package does not support claims beyond this lesson's or any real patient diagnosis.
- • : Relating to the use of science to examine evidence and answer questions in legal investigations, such as identifying a person or cause of harm.
- • : Tiny physical materials, such as hair, fibers, or soil, transferred during contact at a scene, used to link people, places, and objects in an investigation.
- • biometric: A measurable physical or behavioral trait, such as a fingerprint, iris pattern, or heart rate, used to identify a person or track health.
- • observation: Information gathered directly through the senses or instruments, recording what actually happens without yet interpreting it.
- • inference: A conclusion drawn by reasoning from evidence and observations rather than from direct, firsthand measurement.
- • : The documented record of who handled a piece of evidence, when, and where, proving it was never lost, swapped, or tampered with.
- • : A reference sample treated like the others but without the variable being tested, giving a baseline to compare experimental results against.
Use it now: Choose one decision option. Cite E1 and E3, then explain how the rule connects the evidence to your choice.
Go further, optional: The source links below are optional enrichment. Every fact required for today's local evidence decision appears in this lesson package.
Scale markers (rulers) and orientation notes (compass direction, room label) must appear in every scene photograph.
Limit: E1 supplies context or an observation; it does not by itself establish the explanation.
Scene documentation works only as a team SOP, because a missing scale marker, unlogged item, or unrecorded magnification anywhere breaks the chain and weakens everyone's evidence.
Limit: E2 is a teaching statement or comparison and must be checked against the task evidence.
I can document a scene following an SOP with my team.
Limit: E3 supports only the result or product criterion named here; it cannot justify a broader clinical or causal claim.
PLTW-PBT-2026-09-11 · Simulated classroom evidence scenario
Your role: biomedical investigator
Decision: Your team must decide what the evidence from Scene documentation lab supports before submitting the lab report named on the lesson page.
- • Choose the strongest supported explanation.
- • Choose the next evidence to collect.
- • Hold the decision because the evidence is insufficient.
Response: State one choice, cite at least two evidence IDs, explain the rule that connects them, and add one limitation. Submit it as the lab report.
Claim ceiling: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about Scene documentation lab. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
Reason for review: Your team must decide what the evidence from Scene documentation lab supports before submitting the lab report named on the lesson page.
Context: documentation is a team standard operating procedure where every role matters, because a break anywhere in the process weakens the whole chain no matter how good the rest of the work was.
- • T1: Read the scene SOP and assign roles: photographer, sketcher, logger.
- • T2: Photograph and sketch the scene with a scale marker and orientation note.
- • T3: Collect and label , recording each item in the evidence log.
- • T4: Examine a trace sample (fiber or hair) under magnification and describe it.
- • T5: Record one limitation of your documentation and one possible source.
- • E1: Scale markers (rulers) and orientation notes (compass direction, room label) must appear in every scene photograph.
- • E2: Scene documentation works only as a team SOP, because a missing scale marker, unlogged item, or unrecorded magnification anywhere breaks the chain and weakens everyone's evidence.
- • E3: I can document a scene following an SOP with my team.
Measurements: Use only the measurements, units, graph, or counts supplied in today's task. No additional patient measurement is implied.
Figure finding: Teaching diagram for Scene documentation lab. Trace the labeled observation or evidence sequence before choosing an explanation. This is a teaching model, not patient or experimental data.
Uncertainty: This is a composite classroom scenario. Missing history, measurements, or confirmation tests remain unknown and limit the conclusion.
Mean = sum of values / number of values. Median = middle ordered value. Range = maximum - minimum.
For 2, 4, 4, and 10: mean = 20 / 4 = 5, median = 4, and range = 10 - 2 = 8.
Mean, median, and range keep the measurement unit. Order the values before finding the median.
Calculate the requested summary for today's supplied values, then write what it reveals and what it hides.
Students often think Students think a magnified fiber looks the same and means the same thing whether or not the magnification was written down.. The trap: Without the recorded magnification a sketch has no scale, so a thick fiber and a thin one look identical on paper. The number is what lets anyone later reconstruct the true size, and without it the observation cannot be compared to a reference.
Roles: Maria (photographer), Andre (sketcher), Lin (logger).
Photo: One overhead photo includes a ruler for scale and a label reading North.
Sketch: Scaled room sketch with a compass arrow and the table measured at 120 cm wide.
Evidence log:
- Item 1: blue fiber near table leg, bagged and sealed, logged at 10:14
- Item 2: single hair on chair, bagged and sealed, logged at 10:21
Microscopy: Blue fiber sketched at 40x (smooth, uniform width) and at 100x (twisted strands visible).
Contamination risk: A team member leaned over the table, so a stray hair could have dropped onto the scene. We noted this so it can be ruled out later.
| Item | Description | Collected | Logged time |
|---|---|---|---|
| 1 | Blue fiber by table leg | Forceps, sealed bag | 10:14 |
| 2 | Single hair on chair | Forceps, sealed bag | 10:21 |
This model shows the level of evidence and organization needed to complete: A team packet documenting a mock scene to SOP standard, including a scaled photo, a scaled sketch, an evidence log, and microscopy sketches of a trace sample at two magnifications.
- State the question and method.
- Present the observations and data with units.
- Explain the result, limitations, and next investigation.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
Also due today: Submit the team scene packet as a shared document; each member notes their role on the cover page.
- CER:
- Claim, Evidence, Reasoning: make a claim, back it with evidence, explain your reasoning.
- SOP:
- Standard Operating Procedure, the exact steps to follow (especially in a lab).
- Tracker:
- Your PLTW progress log where you record completed evidence.
- myPLTW:
- The PLTW course site where you do the online activities. Find it in Clever with your Microsoft sign-in, right next to Schoology.
Tap the speaker to hear a term. Add two of these to your notebook glossary with a definition and an example in your own words.
Pick just 2 or 3 words from today and make them yours: write what each one means in your own words, name the context clue or evidence that helped, then give one example from what you actually did in Scene documentation lab. Try your own words first; the glossary is there if you get stuck. This is voluntary and counts as extra credit, so keep it short.
Saved on this device. Show Mr. Mendoza or add these to your notebook glossary to claim the extra credit.
Hand-picked readings and interactives for this lesson, from authoritative open organizations and PLTW's own public course outline.
Check yourself · commit, then reveal▸
Claim ceiling for this check: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about Scene documentation lab. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
You sketch a fiber under the microscope but do not write down the magnification. A week later, why can no one determine the fiber's actual width from your sketch?
Write an answer and pick a confidence to unlock the key.
Fast retrieval with instant answers, not the commit-then-reveal check above. Try each from memory first: write what you remember about the earlier units, then check yourself here.
Go further and get help▸
I can name the procedure's purpose and the evidence I will record. I can identify each named hazard and the control that reduces it: Treat all biological trace samples (hair, fiber) as potentially hazardous: wear gloves when handling and do not touch your face. My data table is ready before materials are handled.
Finish the checklist before you handle any material.
- • Treat all biological trace samples (hair, fiber) as potentially hazardous: wear gloves when handling and do not touch your face.
- • Used forceps must be placed in the designated container between uses; never lay them on the table surface.
- • Microscope slides are glass: handle with care; report any breakage immediately and use the sharps disposal container.
- • Evidence bags containing trace material must remain sealed after logging; do not open them without teacher direction.
- • Wash hands with soap and water after completing the trace-evidence station, even if gloves were worn.
- • Photograph equipment is shared: wipe down camera surfaces with a disinfectant wipe before and after use.
- 1Before materials are handled, identify the purpose, variables or comparison, controls, measurement units, and stop-work condition.
- 2Read the scene SOP and assign roles: photographer, sketcher, logger.
- 3Photograph and sketch the scene with a scale marker and orientation note.
- 4Collect and label trace evidence, recording each item in the evidence log.
- 5Examine a trace sample (fiber or hair) under magnification and describe it.
- 6Record one limitation of your documentation and one possible contamination source.
- 7Record each result in the prepared table before interpreting it. Mark missing, repeated, or invalid results truthfully.
- 8Complete the named cleanup and waste route, remove PPE safely, wash hands when required, and confirm the station is ready for the next group.
| Trial or sample ID | Independent condition | Measured result with units | Observation before interpretation | Quality-control note |
|---|---|---|---|---|
Before the procedure, predict the result and cite the rule behind the prediction.
After the procedure, compare the result with the prediction and name one limitation or source of uncertainty.
What today's skills lead to. These are real health-science careers this course builds toward. Tap one to see, on the US Department of Labor's O*NET site, what the job actually involves, what it pays, and how fast it is growing.
As a team, document a home-staged scene (photos, scale sketch, evidence log) and examine a fiber or hair using a virtual microscope, then submit a shared scene packet.
learn.genetics Cell Size and ScaleThen submit your Lab report. Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
Class still runs. Complete the online activity above (it's self-guided). Need the concept taught without a teacher? Use this authoritative explainer:
Khan Academy: using the microscope (Cell biology)- CompleteEvery required part of the artifact is present, nothing left blank.
- AccurateThe science and the data are correct and match the evidence.
- Scientific reasoningYou explain your claim with evidence and reasoning (CER), not just an answer.
- Professional communicationClear, organized, labeled, and written the way a clinician or scientist would.
- SubmittedTurned in the right way, on the class site or handed to Mr. Mendoza in class, and confirmed. Not in Schoology: that is where the report-card grade appears later.
- Error analysis and method · counts doubleName a specific limit of the method and how it moved your result, and compare what you predicted to what happened. "Human error" does not count; say what about the procedure or instrument caused it.