This is to prevent cross-teaming from inmates.
If I punch, you would be hurt, regardless of team or anything - This is to reflect real life.
Penetrating Bullets 
This however is a glitch, when your health goes below 0.
Again, this is to reflect real life.
These rules can be found in below
Please make a modcall using the “Modcall ” Command in-game, or make a report in the intel server.
This is a one time purchase, please contact a sales associate in our main communication server.