Thee has been a few accidents where traps have been brought into disrepute. Especially when they are catching animals that are not on the species list.
The latest to come into the media spot light was a cat being caught be a spring trap. Cats are most definitely not on the species list for the spring fenn trap. And the graphic maiming of the cat by the trap shows that even the most trusted spring traps can cause serious maiming. See here for the article.