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This, baited with peanut butter, is irresistible death. Place one at known rat entrances or run ways. I could catch dumb rats within an hour of placing the trap. Some smart rats took a day or two to give in to the temptation. Also, eliminate any other sources of food. A fat rat is an unmotivated rat. There is no blood, nobody dying in your walls.
I'm on your lawn. How would you get me off of it?
(the legal comments elsewhere are very very pertinent. If you actually asked the question about the 23 year old in CA you would face disciplinary action from your company and possibly a lawsuit from the candidate.)
glassdoor.com gives pretty transparent information. You do have to read between the lines (i.e. suckage at one campus/group is not necessarily a problem at another, poor statistics gamed by shills) but it is useful information.
But networking with people is much much more useful.