A recent study suggests that parents are often unaware of their children's drug use. Here are some warning signs parents should look out for:

Higher incidences of sass-mouth

Child begins using slang such as "groovy," "hepcat," and "23 skidoo"

Happiness, creativity

Becomes very jittery when watching Mad Money With Jim Cramer

Displays glazed eyes and sullen mood whenever parents initiate long discussions about the problems with drugs

Tracks used needles all over the house

Son is type of kid who wears shorts in dead of winter

Child no longer shows interest in taking the Ritalin, Paxil, and Adderall you already have him on