Which of the following is a typical method to prevent contamination at a scene?

Which of the following is a typical method to prevent contamination at a scene?

• A. Changing gloves
• B. Reusing the same gloves
• C. Handling evidence with bare hands
• D. Wearing no PPE

Answer: (A)

Contamination control hinges on using protective gear properly and changing it when needed to avoid transferring material between items. Changing gloves is a common, effective method because gloves serve as a barrier that can be replaced after handling each piece of evidence or after touching non-evidence surfaces. This practice helps prevent cross-transfer of fibers, hairs, soils, or other trace evidence from one item to another, preserving the integrity of the scene. Reusing gloves can carry materials from one item to the next, defeating the barrier and increasing the chance of contamination. Handling evidence with bare hands directly deposits skin oils, sweat, and other residues, and can also obscure or destroy trace evidence. Wearing no PPE leaves both the evidence and the investigator vulnerable to contamination from skin contact, clothing fibers, and environmental contaminants.

Contamination control hinges on using protective gear properly and changing it when needed to avoid transferring material between items. Changing gloves is a common, effective method because gloves serve as a barrier that can be replaced after handling each piece of evidence or after touching non-evidence surfaces. This practice helps prevent cross-transfer of fibers, hairs, soils, or other trace evidence from one item to another, preserving the integrity of the scene.

Reusing gloves can carry materials from one item to the next, defeating the barrier and increasing the chance of contamination. Handling evidence with bare hands directly deposits skin oils, sweat, and other residues, and can also obscure or destroy trace evidence. Wearing no PPE leaves both the evidence and the investigator vulnerable to contamination from skin contact, clothing fibers, and environmental contaminants.