Re: write ups
At my current facility we are encouraged to speak with the person face to face. Our manager does not want to/doesn't have time for petty arguments amongst staff. She will cut you down quick as anything if you go to her with a complaint, however valid; so, personal write-ups don't exist (to my knowledge).
I WILL write up serious med errors no matter who is at fault (pharmacy, nurse, physician). Stuff you can let go, I let go, just pass on to the offender (nurse, tech, pharmacy) that hey, I caught this, keep your eye out next time!