The Protecta EVO Edge is a bait station houses the poison so that the rodents can feed on it as the need. They would not be trapped inside the station and would be able to come and go. If you use a bait that has an acute kill, such as Fastrac Blox, you would not need to worry about secondary poisoning risks. Contrac Blox is an alternative rodenticide where secondary poisoning is very minimal.