In more serious games where the tournaments take place,there is not only an anti-cheat software incorporated but some kind of overwatch system as well. If u reach the threshold of reports for cheating,your demo from game match is sent to certain people,game staff or long time players who will judge if you're guilty or not.
cheating is pretty much useless in this case unless your game style is legit but it's hard to act naturally with wall hack on.
btw the viewing range is limitied in cs go so that you cannot see which direction A or B the hostiles go.
BLACK OPS 3 & CS GO have overwatch implemented.