The same autopen signature was used to sign every document endorsed by former President Joe Biden over the past four years, according to an investigation from the Oversight Project.

The watchdog initiative from the Heritage Foundation revealed on social media Thursday that they “gathered every document we could find with Biden’s signature over the course of his presidency” and found almost every document was signed with the same automatic signature.

“All used the same autopen signature except for the announcement that the former President was dropping out of the race last year,” the analysis revealed. “For investigators to determine whether then-President Biden actually ordered the signature of relevant legal documents, or if he even had the mental capacity to, they must first determine who controlled the autopen.”