One study examined 100 younths in philadeplphia and found that high levels of what in the body was associated with higher crime rates

I think its Lead

Explanation:

Hope this helps

answer:

explanation:

it is often classified as either a schedule ii or schedule iii substance, making it illegal to possess for personal use or distribution. crystal meth can be ingested, injected, or smoked. it is a highly addictive substance and can lead to many different personal, medical, and legal problems.