How do I get my son off drugs? He is addicted to oxycontin and he uses Ritalin which a dr has prescribed?

I think he is abusing the ritilin now and i think he may be using many types of drugs that i do not even know about. i want to know how to get him off the drugs how to keep him off drugs and how to find out what drugs he is using!

thank you for your help so much!

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