Something called “cheese” is killing kids.

In August of 2006, no one had even heard of it — so much so, that when a school district police officer first saw a bag of this drug, he thought it was fake. Now officials realize cheese is all too real; at least 21 kids have died from overdosing on it.

Cheese is a combination of black tar heroin and crushed up Tylenol PM tablets and hits of it sell for a buck or two. Like any type of heroin, cheese is highly addictive and deadly. If that’s not enough to scare you, there’s this: drug pushers cooked it up special for kids.

“Traditionally heroin is going to be an adult user drug,” says Dallas Independent School District Officer Jeremy Liebbe. “Black tar heroin is cooked on a spoon, mixed with liquid and injected. Meaning needles. Not many kids are wild about needles, so if you want to market heroin to kids you've got to come up with an alternative to it.”