[XTR3M3]

Another factor to take into account is your fps vs. the person you are specing fps.....your ping vs. their ping. If there are significant differences in either of these, it will look like they are shooting where the player isn't, but to them they are aiming at them. (specing a scoped weapon is really off in these instances)....as far as what to watch for with aimbot...I look for the "snap to position" that the crosshairs do. I also watch how the move...if they are noobish and sloppy when they are navigating the maps then turn into a L337 rocksteady aiming machine, this also raises suspision. I had alot of the same questions you had too until I spotted a real hacker. My advise is don't perm ban anyone you aren't 100% sure of. Even if you do they can come back because SPAWNPOINT updates the server list frequently. The only way to get them perm banned is demo submission...this will ban them from all of the SPAWNPOINT servers. I know it sucks sometimes when someone owns and it takes away from playing time to watch someone, record them, then submit the demos when they might just be good.
Think of how you would feel if you went to a new server, was having a really good day, owned the server, and then some admin banned you for hacking.....'nuff said.