Integrated Case Processing: Full Workflow Simulation

What This Lab Is About

This final lab practicum puts you in the role of a working forensic technician. You have processed individual item types in earlier sessions; now you will handle a multi-item simulated case from the moment evidence arrives at your bench through the submission of a finished case file. No one will tell you which technique to use next. That judgment is yours, and it is the same judgment examiners and supervisors will trust you to exercise on the job.

Planning Before You Touch Anything

Professional forensic technicians never improvise sequence. Before you open a single evidence bag, write out your processing plan. Ask yourself: Which items are most fragile or most likely to be contaminated by another technique? Biological swabs, for example, must be handled before any chemical reagent work is done on nearby surfaces. Trace evidence—fibers, glass fragments, or soil—can be dislodged by careless handling, so it should be collected before any manipulation that might disturb it.

Your written plan must state the technique you intend to use on each item, why you chose it, and the order you will work through the items. This document is not busywork. It demonstrates your reasoning and, if your results are later challenged, it shows that your process was deliberate and defensible.

Chain of Custody: Zero Breaks Allowed

Chain of custody is the documented, unbroken record of who had each piece of evidence, when, and why. A single undocumented transfer can make an item inadmissible in court and destroy a prosecution. For this lab:

• Sign and date each chain-of-custody form every time you access an item.
• Never leave an item open and unattended.
• Return each item to its original sealed packaging or a new sealed container labeled with the case number, item number, your name, and the date, before moving on to the next item.
• If a classmate, instructor, or anyone else handles an item even briefly, document that transfer immediately.

Treat the chain-of-custody form as the evidence's biography. If something happened to that item, the form should record it.

PPE and Safety Throughout

Every session begins with the correct PPE in place before you open any package. At minimum, wear nitrile gloves, safety glasses, and a lab coat. Change gloves between items to prevent cross-contamination—this is both a safety rule and an evidence-integrity rule. If you are working with chemical reagents (ninhydrin, cyanoacrylate fuming, luminol, or similar), review the Safety Data Sheet for each reagent before use, work in or near the fume hood as required, and confirm the eyewash station is accessible. No food, drink, or personal items on the bench. If you are unsure whether an item may contain biological material, treat it as if it does: biohazard precautions apply.

Processing Each Item

For each item in your case package you will complete a processing worksheet that records:

1. Item description – what it looks like before you do anything to it.

2. Condition on receipt – packaging integrity, any visible damage, preliminary observations.

3. Technique(s) applied – name the method, the reagents or equipment used, and the order.

4. Observations and results – what you saw, measured, or recovered, described objectively.

5. Photographs – at minimum one "as received" photo, one during processing, and one of the final result, each with a scale marker and case/item label in the frame.

6. Disposition – where the item went after you finished with it.

All writing should be in plain, factual language. "A latent fingerprint of approximately 12 mm length was developed on the glass surface using cyanoacrylate fuming" is correct. "A really clear print showed up" is not acceptable in a professional document.

Writing the Final Report

Your case file report has three sections:

Introduction – Identify the case number, the date(s) of examination, the submitting authority (your instructor's fictional agency), and a brief description of the incident summary you were given. State what items you received and your general examination approach.

Item-by-Item Findings – One subsection per item. Report exactly what you did and exactly what you found. Use qualified language throughout: "Results are consistent with…," "The item exhibited characteristics similar to…," or "No conclusion could be drawn regarding…" are appropriate. Avoid absolute language unless the technique genuinely supports a definitive conclusion.

Summary of Conclusions – Briefly synthesize what the collective findings mean in the context of the fictional incident. Do not speculate beyond what your data support. If findings are inconclusive, say so and explain why.

Qualified Language: Why It Matters

Forensic reports are read by attorneys, judges, and juries. Overstatement of certainty is an ethical violation and can contribute to wrongful convictions. Understatement can let a valid finding go unnoticed. Use the language that accurately reflects what your technique can and cannot establish. If you are uncertain about the strength of a conclusion, discuss it with your instructor before you write it.

Passing Standard

Your completed case file is graded on a 30-point rubric: documentation (10 points), technique application (10 points), and report quality (10 points). You must score 24 out of 30 to pass. A chain-of-custody break automatically reduces your documentation score and may prevent passing. Review your chain-of-custody forms and your report for completeness before you submit.