After they get it hauled into the prison, they can lock a prisoner inside it and then turn the machine on to smash the inmate to death.These machines can be found at mostly employee rooms of grocery stores.
Uh, this would be illegal for a state where the Death Penalty is illegal. The only types of executions I've ever heard of are lethal injection, gas chamber, electric chair, firing squad, hanging, stoning, beheading, crucifixion.
