That Darn Cat

It seems that no matter what we do, no matter where we put the litter box or how often we clean the litter box, we have one cat that occasionally doesn't make it to the litter box in time. I've been thinking of going to a pet supplies store to see if they have any special collars that will sense when the cat has to go to the bathroom and push the cat to the box. Do they even make those kinds of collars? If they don't, they really should.