Toxicological test
A toxicological test was a specific forensic technique that identified toxins and similar chemical substances on biological systems, specifically, the detection and treatment of conditions, as well as understanding the mechanisms and effects produced by these substances. 

Doctor Beverly Crusher ran toxicological tests on the thirty-four crewmembers from the  that were killed by each others hand to determine if the cause of their behavior was as a result of a virus, drugs, or a poison. Her tests concluded that there was no unusual substances in their systems. ()

See also 
 Blood-alcohol level
 Blood synthehol level
 Toxin scan (epidermal)
 Toxin scan (subcutaneous perfusion)

External link 
 
Medical scans