A U.S. federal probe has found that about a third of American Apparel’s factory workers in the Los Angeles area had supplied suspect or invalid records and were not authorized to work in the United States.

The findings, from a January 2008 federal investigation, may deal a blow to the corporation’s image as a proponent of immigration reform. But the company said on Tuesday the potential loss of those 1,800 workers would have no significant impact on its results. American Apparel’s Los Angeles operations, employs some 4,500 workers.

In the past, the company has let go of workers whose papers were proven false. Company executives say American Apparel diligently complies with the law, but have pointed out that papers can easily be faked.

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