Answer: Not toxic.
The brand names may vary and the containers might be called discs, chambers, traps or systems, but as a general rule, ant and roach baits are nontoxic. In the past, these products contained poisons like arsenic. Now, the industry uses much safer insecticides - boric acid, fipronil (the active ingredient in Frontline), or avermectin (similar to the ivermectin in Heartgard) - which are specific to insects and don't affect mammals. The low concentration and small amount of the insecticide in the bait means pets are at very low risk of poisoning. The plastic or metal container is actually more dangerous than the bait, as it could pose a risk of GI obstruction. Check with your vet if your pet develops vomiting or other signs of illness, but otherwise, not to worry.