Trying to determine if my son was smoking meth off of foil. What would burned meth residue look like? He claims he was smoking pot from foil, but he has papers for rolling joints. He acted like he was on meth, but claims it was the X that he was ingesting and snorting. He supposedly has made all of his drug disclosures to us - he's been in 2 programs for 4+ months and has 12 months to go.