Murder by Numbers (2002)

Synopsis

Richard Haywood, a Californian high school's coolest kid, secretly teams up with another rich kid in his class, brilliant nerd Justin 'Bonaparte' Pendleton, whose erudition, specially in forensic matters, allows them to plan elaborately perfect murders, just for the kick, for which they set up Richard's marijuana supplier, their school's janitor Ray Feathers, as a psychotic serial killer.