Practice Test Geeks(ETC) Evidence Technician Certification Practice Test
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ETC Biological & DNA Evidence Flashcards

6 cards from real ETC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 ETC Biological & DNA Evidence flashcards as text

  1. Which presumptive test is used to detect the presence of seminal fluid at a crime scene?

    Answer: Acid phosphatase test

    The acid phosphatase test detects the enzyme acid phosphatase found in high concentrations in seminal fluid; a positive result turns the reagent purple.

  2. What is the proper technique for collecting a dried bloodstain from a non-porous surface?

    Answer: Moisten a sterile swab with distilled water, collect the stain, air dry the swab completely, and package in paper

    Dried bloodstains on non-porous surfaces should be collected with a moistened sterile swab, air-dried to prevent bacterial degradation, and packaged in breathable paper.

  3. What is touch DNA and from what type of evidence can it be collected?

    Answer: DNA from skin cells deposited through touch — collectible from surfaces like doorknobs, weapons, and steering wheels

    Touch DNA refers to trace skin cells (epithelial cells) left when a person touches a surface; it can be collected from any object a suspect may have handled.

  4. Why should biological evidence never be packaged in sealed plastic bags for long-term storage?

    Answer: Moisture trapped inside promotes bacterial growth and mold that degrades DNA

    Sealed plastic traps moisture, creating an environment where bacteria and mold thrive, rapidly degrading biological evidence and the DNA within it.

  5. Which body fluid is identified by the presence of p30 (PSA) protein confirmed by immunological testing?

    Answer: Seminal fluid

    p30, also known as prostate-specific antigen (PSA), is a protein found in semen and is used as a confirmatory marker for seminal fluid in sexual assault evidence.

  6. How should evidence technicians handle sexual assault evidence kits (SAFE kits) after collection?

    Answer: Refrigerate them at 2–8°C and submit promptly to the laboratory maintaining chain of custody

    SAFE kits must be refrigerated at 2–8°C to slow biological degradation and submitted promptly to the lab under documented chain of custody to preserve evidentiary integrity.