How Do I Get My Son Off Drugs?

He is not using meth.He is normal he eats alot, sleeps alot,has good teeth is a normal weight.Plus he says he is not and I beleive him.She says he has such a bad temper.Well she really gets in his face because he drives too fast in front of her house and she acts really hateful so he gets mad.I remember that our father had a horrible temper and he never used meth .Meth wasnt even invented then so it runs in the family but she is ruining his reputation by telling other family members and neighbours he uses meth with no proof.He is 20 and he is a little slow sometimes.He just yells alot he hasnt hit anybody. We all live on the same street.

I don/t see him often, but the last few times his nose is runny, eyes are watery, and spends quite a bit of time outside or in the bathroom.

My son is in his 40′s and is renting a room at my home. Recently I have discovered that he is using illicit drugs. My son brings over strangers from time to time and the phone is ringing off the hook with people looking for him. I need to get him out of my home but I can’t have my son living on the streets. His actions make my husband very upset and he no longer speaks with myself or my son. My family and my marriage is at a breaking point and I don’t know what to do.
I beleive the drug is methamphetamine

A co-worker of mine has told me she knows her son is using meth and she doesnt know how to go about confronting. She wants to help him ,but she has no info on it. She asked me about it ,I told her I have used it, some years past and told her its an awful spiral down to ruin. She would like to know how long it stays in the system and any other useful infor mation she can get.Thank you for your help.