Without a way to spectate a player (except for redsec which is certainly high in cheaters), it is hard to verify that a player is exceptional. If a player is exceptional, they are among a group of players who are cheaters. If a player seems exceptional, they are more likely a cheater; especially if they hide their stats and seem to predict players' chaotic movement or preferred spawn location too well.
I played with a level 392 yesterday, for example, who insta-killed me as I crouch-walked alone to an objective they were apparently defending. I said, how do you know and pre-fire? They said sarcasticly, 'because I am cheating'. Others in chat started harrassing me about hackusations, but the game bugged out before I could respond or ignore them. I loaded back in, and the round just ended. A new round started. That player then killed me in spawn, while I was on foot, 4 times in a row, within 10 seconds of spawning, from a helicopter far enough away that I never saw them. Was it luck thst it was me over and over? Were they tracking me with wallhack? How could I know?! How can anyone know? I checked their profile and their stats were hidden. They were 15-0 already. I disconnected. There was nothing more I could do but wonder. In my mind, cheater. What evidence do I have to the contrary? But the server host (admin) was in the game at the time and obviously thought differently since they didn't do or say anything.