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Detention is a 2003 American action film directed by Sidney J. Furie. It stars Alex Karzis as Chester Lamb and Dolph Lundgren as Sam Decker, a high school teacher who is about to retire and has one more detention to proctor. Sam, on the other hand, must unite the troublemakers and outcasts in detention to defeat the criminals and survive because the drug runners have chosen to attack the school. imdb.com