Con Games (2001)

Senator Whitmeyer, whose grandson was murdered while an inmate at California's infamous Doscher State Prison, arranges for Gulf War vet John Woodrow to investigate the case. Woodrow enters the prison in the guise of a convicted murderer named John Wilson. He quickly learns that the Senator's grandson was killed by a corrupt and sadistic prison guard named Lt. Hopkins. Hopkins discovers Woodrow's true identity and has him tortured with electric shocks but Woodrow manages to escape along with a few fellow inmates. A chase and a shootout ensues in the surrounding desert.