There is a contraption called a rat zapper. We used one here to catch chipmunks until we got cats. This little device is run on batteries. You put a little bait in it, the animal goes in it, and it gets a quick, humane jolt. It can be used over and over, and has no ill effects on the environment.
Everyone in entitled to their own beliefs, but poisoning an animal is a slow painful death, and also, if by chance the poisoned animal gets consumed by another animal down the raid, the trail of poison continues.
Also if it gets spilled, etc, more spread of poison. I prefer a quick, clean kill, but that is just my two cents.
The best bait I have ever used is peanut butter cookie dough. I have no idea why it works better than plain peanutbutter. It just does. It has not failed me yet. Best wishes.