Originally Posted by 5Wire

Here's what E-How says about how Decon kills: "Baits differ from traps in eliminating rodents through the ingestion of chemicals that are harmful to the rodents. The active ingredient of d-Con baits is brodifacoum, an anticoagulant commonly used in pesticides, which inhibits the rodents' abilities to digest food and water, making the rodents become starved and dehydrated after eating enough bait." Wafarin is not so powerful as brodifacoum. They may bleed internally, too, but that effect is not mentioned. Either way, an unpleasant death.

So, Yes.