Federal agents raided two locations yesterday in Kentucky and Ohio as part of an ongoing investigation being led by the U.S. Attorney's Office in Pittsburgh.

One of those locations, Spectrum Labs in Newport, Ky., sells products that mask drugs -- like marijuana -- to help prospective employees pass drug tests.

An attorney for Spectrum Labs, Jennifer Kinsley, would not comment last night.

According to the company's Web site, www.urineluck.com, Spectrum Labs was started in 1992 by owner Matt Stephens. Among the products it sells are "Quick Fizz," "Urine Luck" and "Absolute De-Tox."

In May 2005, Mr. Stephens was called before a subcommittee of the House Energy and Oversight Committee to testify about "subversion of drug testing programs."

He refused to answer questions, and pled the 5th Amendment. Also pleading the 5th was Dennis Catalano, who created the company that makes "The Whizzinator," a prosthetic penis in which clean urine is stored to be used to beat a drug test.

Robert Cramer, who led an investigation as part of the Government Accountability Office, testified at the hearing that there are a variety of state laws that deal with masking products. In Pennsylvania, he said, it is illegal to sell urine or adulterants to pass drug tests.

Under federal law, if a product is determined to be drug paraphernalia, the person selling it can be prosecuted.