Just to play the devil's advocate, is there actually any law against leaving bowls of anti-freeze out in your own yard? Would you have to prove intent to poison the cats? Come to think of it, I thought cats didn't have a taste for sweetness, and the sweetness of antifreeze is what makes it attractive to children and dogs. Still a pretty crappy thing to do, to be sure. I'm a cat lover, and while I can understand why some people don't like strange cats roaming in their yards, this is going a little too far.
Yes it is illegal ... in fact can be tried as a felony ... to bait animals ... of any kind. Anti-freeze is VERY sweet to animals and they love it ... though it causes a slow and painful death. The antifreeze we found was in cat sized bowls. One of these bowls also contained cat crunches with anti-freeze poured on it. The intent was clear