Nancy Guthrie Investigation CSI Trick That Can Reveal Hidden Saliva Evidence

A simple Alternate Light Source (ALS) search can reveal biological evidence investigators might otherwise miss. When fluorescence appears under ALS, that material can be collected and sent to the lab for DNA testing.

Retired NYPD Crime Scene Investigator Ed Wallace explains how forensic teams use UV light and barrier filters to detect potential saliva evidence during a search.
This is real-world forensic technique used in crime scene investigations.


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