My husband puts out Dcon. They eat it and then it makes them thirsty. They will then usually leave the house to look for water, once they drink it, they die. Haven't had any problems with one dying any where in the house.
Hockeymom - try putting out dcon in different places in your basement. They also have these new traps that are being advertised on television. The mouse goes inside the trap and then they can't get back out. You don't have to see or touch the mouse. If you have a household pet, be sure and don't let it get into the dcon.