I do my best when it comes to players I suspect as hacking. I spend time spectating them, I notice if their ping is unusually high, look out for following of player models through walls, and repeated registered headshots that are clearly near misses (where their crosshair almost rarely overlaps a player model).

i entered the server when hmb was dominating 7 people, with an unusually high ping of 150. I went straight to spectate, asked if anyone had noticed his obvious use of hacking, no response. I checked his skial activity / stats and steam profile which came up private or empy. I continue spectating him, and I believe he's using a triggerbot, not an aimbot. After confirmation from a few regular LA+ snipers, I managed to get this vote report supported.