You can hack and if the hack is not detected u will not be VAC banned by them detecting the hack, but with overwatch it can take anywhere from a few days to couple of weeks till the account is VAC banned but it says "Convicted by Overwatch" with VAC next to it. but if the hack is good and u smart in the way u play you should be set. tub0z simple ESP, Trigger, and Crosshair in my opinion is the best hack out there been using since release and only got VAC banned cuz Valve was updating CSGO everyday and i got caught in the Ban wave.