GJ Dan
Whenever I am watching a suspected hacker I ask myself, "If he was walling, what should he have known/seen and did not." If he was hacking he should of known that player was there, but did not. If he was aimbotting why did he not hs that guy and why is his spray all over the place when he bursts. I find alot of suspected aimboters dont usually spray and pray. So if u see him/her spraying and its everywhere then he is most likely not aimboting.
Having said that, still keep a eye on him, people can change.
Finally DOnt spend hours in spec watching a suspected hacker hacking. If you cant get him within the first 15 mins he most likely is not hacking and your wasting ur gaming time. But still keep a eye on him when your dead.