I'm sorry to hear about your son, p.o.m. I can't imagine the feelings you, as a mother, must be experiencing. Addiction is most definitely a family disease and yes, once caught in the grips of our preferred drug (or poly-drug use) all bets are off and the self-centered need to get more comes first.
Sadly, for most who get addicted, drug use starts off as fun. In time it turns into something far more ugly, the pain sets in and we don't see any way out of the mess we've created.
I'm assuming that your son is under some sort of medical care at the moment and that is how it should be. He is being cared for by professionals. Is it possible for you to take a moment and think on how you can help and heal yourself (and others in your family)? Addiction affects everyone that the addict is close to (we tend to hurt and use up those closest to us first).
I hope I'm not overstepping whatever boundaries there are during this painful and extremely sensitive time for you but have you thought of family therapy or perhaps even Nar-Anon?
You don't have to (and shouldn't) go through this alone and uneducated. Family therapy (or one-on-one therapy) helps MANY people affected by addiction. Nar-Anon is a self-help support group that helps those affected by someone else's addiction.
Here is a link to Nar-Anon's home page: http://www.nar-anon.org/Nar-Anon/Nar-Anon_Home.html
Additionally, you can find other resources listed below:
Bluelight is much more than what appears at surface level. There is a significant amount of information here for those who need help as well but I would suggest that maybe your son should avoid this and the other numerous drug sites available on the Internet if he intends to get and stay clean.
If you are comfortable with sending me a Private Message with what state/country you live in I can provide more specific information.
Please be well and take care of yourself as well as your son during this confusing time