what is this

Does it really matter?

Not to sound flip or anything but, really, you've got drug paraphernalia. Regardless of what it is -- even if it's Johnson's Baby Powder, you've got all the trappings right there. Instead of playing CSI and trying to figure out if it's crack, meth or heroin, shouldn't you be focusing on getting your son into treatment? In rehab, they're not gonna care that much as to what the stuff is, yes?

Heroin in sold in balloons or a "wax paper envelope", if the bag you found was something other than these, such as a sandwich bag it was most likely not heroin.