Had my teenage nephew and his friend over for the weekend. Husband took them to a concert. Found a little something that was left behind in the room they slept in w/my 11-year-old. Not sure what it is. Want a little info before talking to parents. It's a blue & white capsule (although the white half looks slightly yellowed) fairly large with no imprint or lettering of any sort. Inside is white substance somewhere between granules and powder. Wouldn't a prescription drug have some sort of imprint? Any ideas? Also, where would I send this to have it tested?? I'm in CA.