Dak Prescott is being accused of using a machine to sign his autograph for a memorabilia company instead of signing by hand.

Beckett Grading Services, which evaluates and values trading cards, has refused to verify the Dallas Cowboys quarterback's signature in a recent set.

Steve Grad, the company's principal authenticator, said his company looked at five autographed cards from collectors who received Prescott autograph redemptions from Panini's 2016 Prizm set.

"They had a very machine-like feel," Grad said. "You could see the starts and stops."