Questions about my son's toxicology report?

Great answer from Exdeath. Sorry that you have to ask this in such sad cirstances. Just one extra point - 6-monoacetylmorphine (also known as 6-MAM) is a breakdown product of heroin. There's nothing else you can take that would give a positive result for that. 6-MAM itself gets broken down very quickly, so if you see a positive result for 6-MAM, it is a sign that heroin was used very recently and certainly within the previous few hours. I'm afraid I don't know enough to comment on the actual amounts detected.