I mean it really depends on the size of the rat, and your average trap isn't going to catch a fully undetectable rat, these things hide in you walls, under your floors and hell, even inside you computer, in my 8 years of computing I've had to deal with quite a few of these things, they really like the inside of my computer. So if you know your rat is small you probably wont need a big trap, in this case I'd recommend using a snap trap, more specifically the
Victor Power Kill Mouse Trap, in my opinion, you just can't go wrong with this fine utility, my experience with this product has been nothing but amazing, it's really easy to install, it's powerful and I mean, the unlucky rat that stepped foot on this sucker got demolished, and nothing can beat it's slick, clean design. Now if we're dealing with a much larger rat, I'm afraid it's going to be more costly, fact is, you need a damn big trap to kill a big rat, and most rats are unfortunately large, with that being said I've had the most pleasant experience with the
Victor Electronic Rat Trap.