Does the date plaintiff signed his petition to be sent to prison authorities under the prison mailbox rule?

^1. Since plaintiff is proceeding pro se, he is afforded the benefit of the prison mailbox rule. See Houston v. Lack, 487 U.S. 266, 276 (1988). Under the prison mailbox rule, the date plaintiff signed the complaint will be considered his filing date absent evidence to the contrary. See Jenkins v. Johnson, 330 F.3d 1146, 1149 n. 2 (9th Cir. 2003) (date petition is signed may be considered earliest possible date an inmate could submit his petition to prison authorities for filing under the mailbox rule).