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Anthony Anderson isn't afraid to play a psychotic cop killer in a movie -- telling TMZ, he'd happily accept the role of Christopher Dorner in a film about the accused murderer's life ... as long as the script is good.

Anderson was leaving Mastro's Tuesday night alongside Don Cheadle and the vaporizer-carryingGeorge Lopez when our photog asked if he'd be open to the role ... given Anderson's resemblance.

Anderson replied, "I'm always up for a good role, brother."

So ... you buyin' it? Our vote's still for LL Cool J.