At the moment there are 2 civ clothed Police going around...
There's fully undercover where they have rebel weapons and masks and have been working somewhat independently from patrol Police.
Then there's RTU 'unmarked' Police which have a civ car, casual clothing (still being tested) but don't...
Mine smelt like that literally 2 weeks ago. Smelt around for it, looked like it was coming from power supply. Took power supply out and tried it on its own and it was that.
Had it for three years, sent it in for warranty and got a completely new one!