Our guiding light Insty links to the site walmartfacts.com for some reason or other. Doing a search, our crack team came upon this bit:

We have been such a successful retailer because we focus our efforts on running our stores. Like many companies, we entrust our suppliers and contractors to do the hiring - and that means hiring only documented workers.

Wal-Mart has literally thousands of service and product suppliers - and it just is not feasible for us to verify documents for every employee in every outside company.

...Wal-Mart did not profit in any way from the use of undocumented workers...

Since the raids, Wal-Mart has terminated all of its contracts with outside cleaning contractors. In addition to lowering costs, this move will give Wal-Mart greater control in verifying employees' documentation.

They're also sorry that some of those illegal aliens were allegedly abused while allegedly locked in their stores.