This packet is everything a parent or guide needs to assess Unit 02 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 developing prints, working a comparison, and reporting it honestly.
By the end of the Fingerprints & Impression Evidence unit, a student should be able to:
Six criteria, each judged Not yet / Approaching / Mastered (Page 3).
Develop a latent, lift it, then work an ACE-V comparison.
The student defends an honest comparison aloud (Page 4).
Development method, minutiae, and conclusion 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 produce a clean print and defend an honest comparison. 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 |
|---|---|---|
| Patterns & print types | ||
| Loop / whorl / arch | ridge-pattern types | The three basic pattern families in ridge flow |
| Latent print | invisible print | Left by sweat and oil; must be developed before it is visible |
| Patent print | visible print | Left in a visible medium (ink, dust) — already visible |
| Plastic print | molded print | Pressed into a soft surface (putty, wax) as a 3-D impression |
| Development & comparison | ||
| Minutiae | ridge characteristics | A comparison reports corresponding minutiae, not a percentage |
| ACE-V | analysis, comparison, evaluation, verification | The documented four-step comparison method — verification is not optional |
| Cyanoacrylate fuming | superglue fuming | Develops latents on nonporous surfaces; wrong choice for paper |
| Ninhydrin | amino-acid reagent | Develops latents on porous surfaces like paper |
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| Fingerprint patterns & classification | Cannot tell a loop from a whorl from an arch. | Names the three pattern types but misclassifies ambiguous prints. | Classifies prints into loops, whorls, and arches and explains the ridge flow behind each. |
| Latent, patent & plastic prints & development | Confuses the print types and picks a development method at random. | Names the print types but applies powder, ninhydrin, or fuming to the wrong surface. | Matches each print type and surface to the right development method — powder, ninhydrin, or cyanoacrylate fuming. |
| Lifting, preserving & casting impressions | Smears the print or destroys an impression while collecting it. | Lifts a print but documents or preserves it inconsistently. | Lifts and preserves prints cleanly and casts shoe or tire impressions without distortion. |
| Minutiae & comparison (ACE-V) | Cannot name ridge characteristics or the comparison steps. | Spots minutiae but works through ACE-V out of order or skips verification. | Identifies ridge minutiae and works the full ACE-V method — analysis, comparison, evaluation, verification. |
| Reporting a comparison honestly | Reports a ‘100% match’ or claims the print proves who was there. | States a conclusion but attaches a percentage or overstates its certainty. | Reports corresponding minutiae with no unexplained differences as a statement of consistency — never a percentage, never proof. |
| Integration (cross-domain) | Treats fingerprint work as isolated facts; makes no cross-domain connection. | Names a link from fingerprint evidence to history, reading, or writing but cannot defend why it matters. | Connects fingerprint and impression evidence to its anchor across History · Reading · Writing (plus chosen electives) and defends why the connection matters. |
The split between Approaching and Mastered is an honest comparison: not just spotting minutiae, but reporting corresponding points as a statement of consistency — never a percentage, never proof. Ask “what can you honestly claim, and what belongs to the court?”
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 | Fingerprint patterns & classification | NY / Appr / Mast | |
| 2 | Latent, patent & plastic prints & development | NY / Appr / Mast | |
| 3 | Lifting, preserving & casting impressions | NY / Appr / Mast | |
| 4 | Minutiae & comparison (ACE-V) | NY / Appr / Mast | |
| 5 | Reporting a comparison honestly | 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.