Federal prosecutors allege that a letter submitted by Sam Bankman-Fried in his motion for a new trial was not sent by him from prison, citing that the letter was mailed via FedEx from Palo Alto or Menlo Park—which violates Federal Bureau of Prisons regulations—and that the signature on the letter was printed rather than handwritten. Since Bankman-Fried is serving a 25-year sentence for fraud and is currently pursuing an appeal, the authenticity of this document has been called into question.