your welcome...and just so you know, it tends to be a little slow around here at night and on weekends...but please come back, others may have better answers or be able to tell you directly what to do...
so stick around...
if he is 17 his parents still have the control legally...i would suggest getting him into some type of inpatient rehab, if his use has been short term, his chances of recovery are good, the only thing is he has to also realize he needs to change he may resist treatment, but as long as he is under 18 he doesnt have a say, in most states anyway...i am pretty sure it is the same everywhere though, it sure wouldnt hurt to put in a call somewhere in your area and find out what options are available for help...hes still young, i wouldnt wait...
good luck and i hope this helped some...you might want to repost you question in the morning when more people are around..
best wishes...