Name a common source of contaminating fingerprints at a crime scene.

A common source of contaminating fingerprints at a crime scene is indeed the investigators’ fingers, clothing, or tools. When crime scene personnel arrive and begin to process the scene, they may unintentionally leave their own fingerprints behind. This can occur when investigators touch surfaces while examining evidence or manipulating items. Furthermore, tools used during the investigation can also introduce contaminants if they touch or disturb areas where fingerprints might be present.

Understanding this source of contamination emphasizes the importance of maintaining strict protocols when processing a crime scene. Investigators are trained to use protective gear and follow proper handling procedures to minimize the risk of leaving their own prints or any other trace evidence at the scene. This ensures that the integrity of the evidence remains intact for analysis and helps in the accurate interpretation of the fingerprint evidence collected.