This packet is everything a parent or guide needs to assess Unit 05 at home — learning targets, the answers that count as correct, the mastery rubric, calibration examples, and a clipboard score sheet. No multiple-choice test: the student shows mastery by working simulated stains through presumptive screening and bloodstain pattern analysis and reporting what each result does and does not establish.
By the end of the Blood & Bodily Fluids unit, a student should be able to:
Six criteria, each judged Not yet / Approaching / Mastered (Page 3).
Screen and type simulated stains; reconstruct a bloodstain pattern.
The student says what a presumptive positive does and does not establish (Page 4).
Screening result, confirmation, and interpretation kept distinct.
You are making a decision, not adding up points. For each criterion, decide whether the work is Not yet, Approaching, or Mastered — the column language tells you which. A criterion counts as mastered only when the student can both run the test and report what the result does and does not establish. A student carries three tokens per term; one token buys a re-do of one criterion on another day, so a single bad afternoon never sinks the unit.
Accept any answer in the synonyms column — they are pre-approved as equivalent. The third column flags the confusions that look close but are not yet, so you can coach precisely.
| Canonical answer | Accepted synonyms | Common confusion / discriminator |
|---|---|---|
| Presumptive & confirmatory | ||
| Presumptive test | screening test (Kastle–Meyer, luminol) | Flags possible blood; a positive is a lead, not proof it is blood |
| Confirmatory test | identity-confirming test | Establishes what a stain actually is; comes after a presumptive screen |
| Acid-phosphatase test | AP screen (for semen) | Presumptive indicator for semen; still requires confirmation |
| Luminol | glow-based blood screen | Reveals trace or cleaned blood by glowing; presumptive, can react with other substances |
| Typing & pattern | ||
| ABO blood typing | ABO group (A / B / AB / O) | Narrows a population; never identifies a person |
| Antigen / antibody | blood-group marker / immune protein | Antigens on cells define the type; antibodies react in typing |
| Bloodstain pattern analysis | BPA | Reconstructs geometry from stain shape; interprets, does not identify a person |
| Angle of impact | impact angle | Estimated from a stain’s shape; feeds the area-of-origin estimate |
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| Presumptive testing (Kastle–Meyer, luminol) | Treats a presumptive positive as proof that a stain is blood. | Runs the test but cannot say what a positive does and does not establish. | Uses a presumptive positive as a lead only, explaining that it flags possible blood and must be confirmed — never that it identifies blood or a person. |
| Confirmatory testing & body-fluid identification | Cannot distinguish a presumptive screen from a confirmatory result. | Names confirmatory methods but treats the acid-phosphatase screen for semen as if it were conclusive. | Sequences presumptive screening then confirmatory identification, and reports the acid-phosphatase test as a presumptive indicator for semen that still requires confirmation. |
| ABO blood typing | Claims a blood type identifies the person it came from. | Types a sample but overstates what the result proves. | Reads ABO type correctly and reports it as narrowing a population, never as identifying an individual. |
| Bloodstain pattern analysis | Reads nothing from stain shape or ignores its geometry. | Notices pattern differences but cannot estimate angle of impact or area of origin. | Uses stain shape and angle of impact to estimate the area of origin, stating the limits of the reconstruction. |
| Technique & biohazard safety | Handles simulated samples without contamination control. | Follows some precautions but cross-contaminates or documents carelessly. | Works simulated samples with disciplined contamination control and documentation, treating every sample as if integrity and safety matter. |
| Integration (cross-domain) | Treats the science as isolated facts; makes no cross-domain connection. | Names a link to history, reading, or writing but cannot defend why it matters. | Connects the unit to its anchor across History · Reading · Writing (plus chosen electives) and defends why the connection matters. |
The split between Approaching and Mastered is what the result establishes: a presumptive positive is a lead, a confirmation is an identity, and a type narrows a population. Ask “what does this result let you say — and what does it not?”
Read these before you grade. They show what Mastered and Not yet actually sound like, plus the edge cases where you should coach rather than decide on the spot.
Student: ______________________________________ Date: _______________ Guide: _________________________
| # | Criterion | Decision | Notes |
|---|---|---|---|
| 1 | Presumptive testing (Kastle–Meyer, luminol) | NY / Appr / Mast | |
| 2 | Confirmatory testing & body-fluid identification | NY / Appr / Mast | |
| 3 | ABO blood typing | NY / Appr / Mast | |
| 4 | Bloodstain pattern analysis | NY / Appr / Mast | |
| 5 | Technique & biohazard safety | NY / Appr / Mast | |
| 6 | Integration (cross-domain) | NY / Appr / Mast |
☐ No ☐ Yes — for criterion: __________ Tokens remaining: ☐ 3 ☐ 2 ☐ 1 ☐ 0
NY = Not yet · Appr = Approaching · Mast = Mastered · Unsure between two levels? Circle the lower one and note what a re-do would need.