If they had JUST made it believable...
But they seemed to use the typical blue print of a cheap jack horror film. You know, the kind where the killer pops up anywhere. Carradine gets tazed and he's up and walking in two minutes? They smack each other with two-by-fours and they just shake it off? The little girl attacks four people at the child protective services and has them all on the floor? Gimme a break.
There is no "off" position on the genius switch.