Applied DNA Sciences Inc., a Stony Brook-based maker of anti-counterfeiting products that use plant DNA, has signed a five-year contract with a U.S. government agency worth up to $2.5 million.

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The company, which develops anti-counterfeiting and authentication products using DNA markers, sells its technology for a variety of purposes, including detection of counterfeit drugs and textiles, and the identification of stolen property. The company did not disclose the name of the agency, but said it was not the Department of Defense.

The contract expires in 2021, and allows Applied DNA to sell any of its products to the agency for up to $2.5 million. “This relationship gives us exposure throughout the government into additional nonmilitary agencies,” said James Hayward, chief executive of Applied DNA.