Which statement is INCORRECT regarding methods of avoiding cross-contamination at a crime scene?

Which statement is INCORRECT regarding methods of avoiding cross-contamination at a crime scene?

• A. Putting on new gloves after handling bloody items
• B. Putting on new gloves after handling liquid or powder chemicals
• C. Packaging each piece of evidence separately
• D. Allowing the entire crime team to help collect evidence if you are running out of time

Answer: (D)

The idea here is to prevent cross-contamination by limiting who handles evidence and how it’s handled. To keep evidence pristine, gloves are changed between items, each piece is packaged separately, and only trained personnel follow a controlled, step-by-step process to collect and document items, preserving the scene’s integrity and the chain of custody. Allowing the entire crime team to help collect evidence when time is tight undermines that control. More people touching items increases the chance of transferring trace evidence from one object to another, contaminating samples and making it harder to establish where each item came from. Time pressure doesn’t justify loosening these safeguards; instead, teams should be organized so that a designated, trained subset handles collection, with clear roles, proper PPE, and sticking to single-item handling and proper packaging. If more hands are needed, bring in additional trained personnel and follow the same procedures to maintain evidence integrity.

The idea here is to prevent cross-contamination by limiting who handles evidence and how it’s handled. To keep evidence pristine, gloves are changed between items, each piece is packaged separately, and only trained personnel follow a controlled, step-by-step process to collect and document items, preserving the scene’s integrity and the chain of custody.

Allowing the entire crime team to help collect evidence when time is tight undermines that control. More people touching items increases the chance of transferring trace evidence from one object to another, contaminating samples and making it harder to establish where each item came from. Time pressure doesn’t justify loosening these safeguards; instead, teams should be organized so that a designated, trained subset handles collection, with clear roles, proper PPE, and sticking to single-item handling and proper packaging. If more hands are needed, bring in additional trained personnel and follow the same procedures to maintain evidence integrity.