Only Hacker Pro makes you invisible to motion sensors). There are some caveats to the last one, though.

Especially when deaths are less than five. Wall hacking is the most commonly used type of cheat where one can see through walls and track enemies from very far distances. Speed hacks (he moves much faster than anyone ever can) and health cheats (he just does not die) are more obvious, so I am not going to mention them

It is very hard to tell nowadays, where you can rack up kills on tight maps like NukeTown by using Hardline and getting a mass destruction weapon like the Gunship or the Chopper Gunner.