Method for Postmortem Quantification of Δ9-Tetrahydrocannabinol and Metabolites Using LC-MS-MS.A specific, sensitive, fast and simple method for analysis of Δ9-tetrahydrocannabinol (THC), 11-hydroxy-Δ9-THC (THC-OH) and 11-nor-Δ9-THC-9-carboxylic acid (THC-COOH) in routine postmortem cases using LC-MS-MS was developed and validated. 
LC-MS-MS
Prior to solid phase extraction, urine, stomach contents and bile were pretreated using alkaline hydrolysis, while blood and vitreous humor were pretreated with protein precipitation. 
solid phase extraction
Prior to solid phase extraction, urine, stomach contents and bile were pretreated using alkaline hydrolysis, while blood and vitreous humor were pretreated with protein precipitation. 
protein precipitation