If you want your rat/mouse problem solved in a bloodless & humane manner, buy a ratzapper (ratzapper.com).
I also had a problem in the garage, and this device was great. It is a plastic chamber about the size of a loaf of bread, with a metal plate in the back. Put some dog food in, rat walks inside, steps on plate and is electrocuted almost instantly. There is a light on the top which will blink if tripped, so you can just look in the garage periodically to see if it worked. Disposal of dead rat is clean and simple, just pick up the device and empty into the trash. You will never have to touch a rodent, so you could take care of this yourself, while your son is “blazing” through his homework…
Another note, coumadin (warafin) was originally developed as rat poison. It is given in low doses to humans as a blood thinner – so if you ever have to take it to bust up a blood clot, you can indirectly thank a rat!
