The main cannabinoid found in the plant Cannabis sativa, and the compound largely responsible for its psychoactive effects. There have been reports that use of THC has been linked to the onset of psychotic episodes in both healthy users and, in particular, in schizophrenics. It has been used as a possible treatment for a number of medical conditions. It is used illegally in the form of cannabis, which is a class C drug in the UK. Tetrahydrocannibinol can be detected by the Duquenois–Levine test.

Tetrahydrocannabinol