When someone stops using, you dont need a drug test to tell. Money stops disappearing, wildly erratic behavior and mood swings stop, as do 3 hour trips to ‘go grab cigarettes’, and weekly if not daily ‘flu symptoms’ disappear as well. Opiates have a short half life, and usually are undetectable by UA in about 3 days, maybe more for oxycontin b/c of its extended release characteristic.
In my experience even if you catch the person, you can really do nothing of consequence anyway short of cutting them off from whatever they may be relying on you for if you havent already. Dont believe that ‘intervention’ bullshit.
Nobody gets clean until they get their ass handed to them enough times that they decide they want something better for themselves, they get locked up, or die. I chased a dope habit from about 17-23, and thank God I got out of the game early. Im clean over 6 years now. I had legal, health, and family problems and none of it mattered until I wanted it for myself. Good luck man.
EDIT-He may want to look into drug regimens to ‘kick’. Methadone is antiquated, evil, and there are better alternatives out there. Syboxin (Suboxon) is perscribed by most MD’s now and is helpful at easing the withdrawl symptoms. Those drugs are good for getting them out of the vicious cycle of opiate addiction (get money, get drugs, repeat or get sick), and also removes the get sick excuse from the equation. So if the guy has a full script of syboxin, and is still getting high, you know hes not ready. Follow me? sorry for the long post, but this shit hits home for me, pm me if you have any problems or questions.