Originally Posted by EMAW

The answer is...they don’t. And neither does ops if you have a valid reason for refusal. If they do, our safety department and DO will both back as long as you have a valid reason for refusal.
In 3.5 yrs I’ve never been pushed to do anything that I wasn’t comfortable doing, but I’ve never just said no either. Usually it’s, “I can’t do that, but I can do this.”
If you are overworked the the point of exhaustion, bang out fatigued. No extra paperwork (unless you want do it to help the other guys in your situation), and you won’t hear anything else. They may ask you the circumstances, so they can avoid it in the future. If you don’t say anything, they don’t know. They’re gonna try to utilize the aircraft as much as possible.