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Name: mike
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my friends have a house with a basement, they have seen rats coming from cider blocks that are open at the top ,and on inspection with a mirror seem to go all the down to the foundation, i suggested maybe putting moth balls down the blocks to help out if they are coming from the botton up, they have a new baby in the house, will this hurt anyone or cause harm? thanks

Moth balls are not going to hurt anyone, but they are not going to solve the problem either. Rats are serious pests that will not be deterred by moth balls and a permanent solution, sealing up access points after removing the rats, will be needed.

J. Elliott

Stuff the holes with steel wool. It's not poisonous, it's cheap, and rats can't chew through it.

Richard E. Barrans Jr.

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