If I fail the P.O.S.T. mandated Structured Interview (SI), may I reapply? By Scott Meredith | February 14, 2017 - 4:29 pm |December 5, 2017 You will be allowed one (1) opportunity to pass the SI. If you do not pass the SI, you must wait six (6) months before you can reapply. Bookmark the permalink.