The Expert(1995)

SWAT-Team instructor John Lomax's faith in the American justice system is shaken when the sociopath who murdered his sister is sentenced to life in a mental institution rather than to Death Row. Internal pressures upon Lomax mount when he is attacked by a mentally unstable woman desperately trying to free her brother from jail before his execution. When Lomax begins talking about ways to get to his sister's murderer and to kill him for revenge, his girlfriend and his partner get seriously worried. Meanwhile, the killer himself has devised an escape plan and he doesn't care who gets killed during the ensuing mayhem.