ETC Storage & Preservation 3

Question 1

Which packaging material is CONTRAINDICATED for storing arson evidence containing volatile accelerants?

Accepted Answer

Plastic bags

Answer

Plastic bags allow volatile accelerants to permeate through the bag walls, causing loss of evidence and potential cross-contamination.

Question 2

Under what circumstances should a wet item of clothing be stored in a paper bag rather than a plastic bag?

Accepted Answer

When it is still moist and biological evidence may be present

Answer

Wet clothing with biological evidence must be stored in paper (breathable) bags to allow moisture to evaporate and prevent mold that destroys DNA.

Question 3

What is the maximum recommended storage time for urine drug evidence samples at 4°C before analysis?

Accepted Answer

7 days

Answer

Urine drug samples are generally stable at 4°C for up to 7 days; longer storage requires freezing to prevent bacterial growth and compound degradation.

Question 4

An evidence room log shows two items with identical property numbers. What is the BEST immediate action?

Accepted Answer

Quarantine both items and initiate an audit

Answer

Duplicate property numbers indicate a cataloging error; both items must be quarantined and audited to determine the correct association before any further action.

Question 5

Which type of evidence requires storage in a humidity-controlled environment to prevent cracking or warping?

Accepted Answer

Wooden tool handles and document paper

Answer

Wood and paper are hygroscopic materials that expand, crack, or warp with humidity fluctuations, which can alter tool mark patterns and obliterate handwriting impressions.

(ETC) Evidence Technician Certification Practice Test

(ETC) Evidence Technician Certification Practice Test

ETC Storage & Preservation 3