Specifically, there is a way to get the damage logs so you may prove that your claims are true.
All you have to do it type:
ttt_print_damagelog
(and since I can't put it better myself, I'll let gamefreak explain.)
[pootis] in console at the end of the round. This can basically prove that someone shot you but didn't kill you, which is useful. Or that they were shooting and provoking everyone.
When you enter that command, the console will output the damage log. It will look like this:
(http://cloud.steampowered.com/ugc/560911634082050322/1BFF7284CDFFAFFDB6A81CE98639084982D970DD/)