It has been known that about 35% of MDMA taken is excreted within 24 h by itself. The excreted urine of MDMA abuser
possessed not only MDMA itself, but also its metabolites of the 4-hydroxy-3-methoxymethamaphetamine (HMMA), and
methylenedioxyamphetamine (MDA). Thus MDMA, HMMA and MDA were preferably tested together for MDMA abused urine samples.