Detective: the robbery at the mall was carried out by a mall employee acting alone roughly one hour after the mall closed last saturday night. the only employees present at the mall at the time of the

Detective: the robbery at the mall was carried out by a mall employee acting alone roughly one hour after the mall closed last saturday night. the only employees present at the mall at the time of the robbery were security guards evans and clark. since the mall's surveillance system was disabled by the thief just before the robbery, the thief must be evans. the argument above would be valid if