Russell Saadey (defendant) was charged with filing false credit applications. The prosecution introduced Saadey’s tax forms into evidence. Saadey admitted that the tax forms contained his signature. The prosecution also sought to introduce the false credit applications, which allegedly also contained Saadey’s signature. The prosecution did not call a witness to authenticate the false credit applications as containing Saadey’s signature. Rather, the prosecution sought to allow the jury to compare the signatures on the false credit applications with the signatures on Saadey’s tax returns. The district court permitted this comparison over Saadey’s objection. Saadey was convicted. Saadey appealed, arguing that the false credit applications had not been properly authenticated as containing his signature.