The detection of cannabis constituents in the mouth and on the fingers of smokers

Detection of drug residues on the hands of subjects by surface sampling and ion mobility spectrometry

This paper deals with the detection of drug residues on the hands of human subjects. The results demonstrate that detectable amounts of particulate matter are transferred to the hands by brief contact with drug tablets. A sampling and analysis method has been developed, and is based on the aspirating and trapping of drug microparticles on a filter plug, to be followed by thermal desorption directly into an ion mobility spectrometer. The technique is suited for initial field screening in clinical and forensic applications. The major drugs detected were diazepam, amitriptyline, codeine, acetaminophen, nitroglycerin, and delta 9-tetrahydrocannabinol (delta 9-THC).