I have been recording hackers for some time, with predator.
As far as I can tell, you can recognize a cheater by two things only.
1.Aim snapping, which can be obvious and not so obvious in the fast close combat clashes.
Obvious is spine breaking of the mech. You can clearly see them snapping to targets around them.
Not so obvious can be seen on more "experienced" pilots which use them when they think nobody is watching.
Still, there is mild snapping.
2. Super prediction. By this I mean knowledge of any mech positions on the map at any given time.
I have encountered one guy who would find me in far corners of the map, boosting with scout towards my exact
position, jumping and shooting in my face. I am cloaked and behind the cover. No scanners, no scramblers, no movement,no shooting, nothing. Far away from the action. He found me every single time during that match. He dies (not by my hand), he spawns ,boosts towards me.I changed positions, used cloak, cover, moved away from the scene.Guess that was a radar thingy.
Some demos.
Triggerbots and other stuff is untraceable IMO.
Radar usage is also very hard to tell unless they demonstrate it to you on purpose.