drug issues....

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I was asked a question relating to the issue of drug by a neighbor who suspected his teenage son is into drug habits, how to detect if someone is on drug, unfortunately I am not so versed in this area but told him that I am only sure of when one is into sniffing powder so I told him the little I know about that. But I know there are other drugs that don’t require sniffing, can you mylot friends here help by giving me tips on how one can detect if a youngster is into drug habits?