there was a show on the discovery ch. last year. i spased the name just now. anyways it was based on a LA Ca. exterminator buissness. roaches, mice, ants, bees and rats. they used a rat trap named "rat-zilla" i think. it was very effective. looked like a snaping bear trap. the bait they used on snaping traps was peanut butter. another thing they said was to put the traps along wall ways or known travel routes. rats have very poor eye site.