The kids take the watered-down black tar heroin, or "monkey juice," and mix in crushed Tylenol PM tablets. Officer Jeremy Liebbe of the Dallas ISD Police Department uses this display sample in his presentations to school counselors. The sample contains, from left to right, 1.3 grams of actual heroin-based "cheese," two paper bindles, two small Ziplock-style baggies and 10 Tylenol PM caplets. (Dallas ISD Police Department)