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.
Plot
Former soldier Sam Decker is a teacher at Hamilton High School. A veteran of the former Yugoslavia and the Gulf War, he returned to his inner-city neighborhood after serving in the military to give back to his community. Frustrated by his teaching experiences, Sam submits his resignation feeling the education system doesn't work. Before he leaves, he commits to supervising a final detention duty with the school's most difficult students.
A well-organized group of murderers plans to hide $300 million worth of heroin that they've hijacked, using hidden compartments in two police cars in the school's auto shop. The ringleader, Chester Lamb, is surprised to find that Sam and the kids from the detention room are still inside the school, since the school security and local police have been paid off to ensure there would be no witnesses. Lamb sends his henchmen to eradicate Decker and the students, directed by Lamb using the school's surveillance and security systems. Sam and the kids work together to defeat the armed robbers, and find evidence of a far-reaching plot that includes the police department and high levels of government.