So sorry to hear about your losses. Not all of the rat poisons are anti-coagulant, some cause swelling of the brain and act a little faster. Since the clotting factors are made in the liver, the liver and intestines probably should look fine if it was some other type of rat poison. You'd have to read the label to know which type of poison, and therefore what, if any, signs to expect at necropsy. I'd suggest "kid proof/pet proof" bait stations, but I don't have any raccoon experience...