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James McAvoy in ‘Filth’ Trailer: Sex, Drugs and Police Work (Video)

James McAvoy in 'Filth' Trailer: Sex, Drugs and Police Work (Video)

The hallucenigenic film about a corrupt Scottish cop is an adaptation of another Irvine Welsh ("Trainspotting") book

James McAvoy both chases down – and is – the "Filth" in the new trailer for the eponymously-named movie.

Corrupt Detective Sergeant Bruce Robertson (McAvoy) used to be a good person, or so he says. But now, he's pretty much disgusting. Robertson uses his status for sexual favors, access to devious venues and, of course, to score drugs. Lots and lots of drugs.

See video: James McAvoy Is the Most Crooked Cop Ever in 'Filthy' Trailer

The motivation for the on-screen manipulations of the bipolar, junkie cop seems decent enough though: Robertson wants to earn a promotion in hopes to win back his wife and daughter. However, cocaine, a sex addiction and hallucinogenic drugs get very much in the way.

"Filth" is the fourth film adaptation of Irvine Welsh's novels, following "Trainspotting," "The Acid House" and "Ecstasy."

The film comes out in Scotland — its setting — on Sept. 27. It opens across the U.K on Oct. 4. No release date has been announced yet for the U.S.

Watch the trailer — just not while at work: