In real life:
Never shoot anyone, don't get involved with things like finding out conspiracies within terrorist organizations.
In TTT:
Shoot at people's feet from high places with a scout, so some genius shoots you right away and loses 500 karma.
Follow people around suspiciously, constantly change weapons, always aim at their head and try to stay behind them with no intent of harming them whatsoever.
Use a computer monitor to push a vending machine at 50mph and crush everyone into dust.
Stab someone in the foot with a combat knife, and they instantly die and bleed out all over the floor.
If you examine the DNA of a dead body, it will magically tell you the GPS coordinates of who killed them.
It is possible to completely disguise yourself with a simple device that can be switched on and off with the push of a button.