Questions about drugs/possibly meth?

Sooo, this is a very long story, but a young boy has been living with us temporarily. This boy is a pain in the a$$. He has a history of drug abuse and a huge police record. I think he has been doing drugs again in our house. Lately, I have found cut squares (about 1 inch wide) of aluminum foil in the bathroom he uses, hidden in his bag. It has a little black residue on it. I have also found pens that have been taken apart. I’m not stupid. I know he is doing drugs. But a policeman I talked to said he is almost certain this drug he is using is crystal meth, and that cocaine and heroin are not used with aluminum foil, but I have heard from other sources that cocaine and heroin and basically any drug can be used with aluminum foil. Basically, what drug do you think he is on? And can all drugs be used with squares of aluminum foil? Your help would be appreciated! Thanks! =]
Also, he barely EVER eats. He never sleeps and he’s pretty hyper active. Oh, dear, who am I kidding? I think I know what the answers will be…=[

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