mods don't know the rules?

[goigle!]

Your vehicle was black and there was no lightbar. We removed these modifications on your car because you were not undercover/unmarked. You were the police sergeant. A police sergeant should not have a black police cruiser without a lightbar. Your job did not even state you were unmarked. Ofcourse we removed the modifications since you had no need for it.

and why should it? Unmarked police cars are largely used for traffic enforcement. Undercover and unmarked are two very different things.

Undercover = no lights/sirens, maybe a radio (used in undercover operations)
Unmarked = No markings

Unmarked cars will more often than not (unless it's a detective) have a uniformed officer (so the public knows they are being pulled over by a cop and not some hack with lights)

fuck, I'm making a video explaining this shit

also, shouldn't a vehicle be removed instead of modified?

Your job still did not explain you were unmarked. Therefore your lightbar and your color got removed.

If that was the real problem then removing the color would be the only needed action.
Also, the lightbar was not removed.