I don't know. I guess that would depend on specifics the agreement between Alaska and ALPA. I do know that at many airlines, pilots in their probationary period don't enjoy the same employment protections as a pilot who is past the probationary period. There's no overarching legal principle that compels an airline to give a pilot who's violated alcohol policy to offer a second chance based on HIMS participation. It's common, but not some sort of inherent right (beyond being specified in a contract). So without knowing the details, I'd say its certainly possible that there's no HIMS second chance available to probies.