well if he doesn't appear to be "high"...then either he's a daily user, has a major tolerance, or he is only snorting small amounts at a time for the amphetamine effect....because if he was in a full blown roll then you would definetly be able to tell...pupils fully dialated, raised body temp, sweating, feeling of love/euphoria, etc.- if you want to learn more about MDMA check out erowid.com(filled with info, it might be erowid.net or erowid.