Ever since the rap duo Substance Abuse dropped their critically acclaimed single "What The F**k You Rhymin' For?" back in 2000, they have been hailed as the emissaries of the golden era in hip-hop. Following up with singles featuring lyrical heavyweights MF Doom, Rasco, and P.E.A.C.E. of Freestyle Fellowship, Substance Abuse has had fans eagerly awaiting their first full-length release. "Overproof" is a term signifying "more than ample evidence" of their eminent dopeness. It's no wonder that they made Urb Magazine's "Next 100" for 2005! Features Kool Keith, MF Doom, Rasco, Motion Man, Kut Masta Kurt, P.E.A.C.E., Saafir and others.