When SEC lawyers sued former Maxim Integrated Products CFO Carl Jasper for backdating stock options, they pointed to some damning evidence. It was handwritten notes from Maxim CEO Jack Gifford instructing Jasper to expense the backdated options, a step that would have made the backdating legal.

But now Jasper’s lawyer, Steven Bauer of Latham & Watkins, is trying to poke holes in the evidence, suggesting that those notes were faked. The allegations were made in a motion Tuesday to compel the SEC to turn over transcripts of an interview with Gifford, who died in January.