Mouse poison is not really a problem for predators. A mouse would have to eat like a Rottweiler in order to store enough poison to endanger a predator later. And you don't have to put the mice where other animals can eat them. Mine get their own version of Space Mountain, right to the septic tank. Either that, or I dump them in the trash.
Where I live, it would be a great blessing if dead mice poisoned other animals. I have coons, possums. bobcats, coyotes, foxes, and squirrels. They all need to die, basically.
I don't rely on poison by itself to kill the mice. I use it because it's an ideal tool to make traps do what they're supposed to do. The mice don't get to eat it, because the traps kill them while they're trying to grab it.
I've used the old wooden traps with peanut butter, bacon, factory mouse bait, and God knows what else. The mice lick the traps clean and run off. When you use a Tomcat plastic trap with peanut butter under a ball of Victor poison, the mouse has no shot. The mouse has to move the ball to get the peanut butter, and when it does that, it dies. I have a 100% kill ratio with this method. I have never found a snapped trap with no mouse in it or an unsnapped trap with the bait gone. I have reused the same bait balls because the mice died before they could eat them.
With the wooden traps, the mice usually won, and I've seen a mouse run across the house with a glue trap stuck to it and then escape. I've seen them shake glue traps off, and I've found footprints in glue traps that didn't have mice in them.
The mice love the stink of the Victor balls, just as they love the smell of peanut butter. Put them together, and a mouse can't resist. I assume other things will work, but using poison balls guarantees me kills if the mice ever succeed in stealing bait.
I also use bait balls to see if there is mouse activity. Put several in a neat row on the floor, and if there is a mouse around, you'll wake up to see the balls moved. If nothing happens for many days, you know you probably don't have a hole in your roof vent or some other opening mice can get in.
I don't worry about dead mice stinking the house up, because it hasn't been a problem. I've put glue traps in my attic, and when I caught mice, I never noticed any smell. Maybe other people with different construction would have problems. I had some smelly mice when I found them in traps I set in the open, but it's not a big deal. Flush and mop. Problem gone.
I wouldn't use the bait balls where a pet could get at them, or if I had really stupid children, but they're perfect for my situation.
Now that the roof is fixed, I don't expect to need the traps, but they will definitely do the job for other people.