So a teacher got drunk on a school trip with primary school children. He was assumed to be on night duty with the rest of the teachers - but he was away at a bar getting drunk. He then didn't show for work until late into the afternoon the following day. I was not on the school trip myself but I heard this story from another teacher on the Friday evening (after the trip had ended). She pledged that she would tell the head teacher what had happened. She also explained that someone else of authority was on the school trip and may or may not tell the head teacher the truth or the whole story. This person from administration could be reluctant to explain to the head teacher the truth because she's soft and hates confrontation, and is new to the job. Anyway, I have now found out that the story told to the head teacher by the admin lady was that the teacher had simply been arguing with others the night before - which is why teachers are now walking around and are not happy with him. The other teacher didn't keep her pledge and has not said anything to the head teacher in fear of the admin lady being exposed for her lies. I am ready to walk into the office and tell, becuase I can't stand the unprofessionalism of this drunken teacher. He's always been like this and I'm not prepared to work with his bog standards next year. Should I tell?