Detection time of regular THC use in urine shorter than often assumed
International Association for Cannabis as Medicine

Urinary elimination of 11-nor-9-carboxy-delta9-tetrahydrocannnabinol in cannabis users during continuously monitored abstinence.
Unbound MEDLINE | Urinary elimination of 11-nor-9-carboxy-delta9-tetrahydrocannnabinol in cannabis users during continuously monitored abstinence. Journal article abstract