And they seem so brazen. Often in broad daylight, and if confronted they will threaten violence and carry on rather than doing a runner. Presumably they dont consider the chances of of being caught by the police as very high.
I think about 30 odd years ago we had a spate of thefts locally from particular cars. Long before cat converters . I cant remember what it was . Might have been new fangled radio technology.
The local police parked 'trap cars' in likely locations. If attacked I think these a silent alarm, and in those days there were enough police patrols for a high chance of being caught. I think it might also have dead locked the scum bag inside the car.. I dont know if they ever actually caught anyone, but their existance wasnt kept secret from local crooks (or honest citizens like me) . The spate of thefts ended. Could all have been a bluff. Maybe there werent really any trap cars
They could do the same for cat converter thefts. Maybe a mk 1 jazz left somewhere likely with a tracker hidden in the cat. Track them back to their lair, or to the crooked scrap dealer. Or with lots of video cameras under the car and elsewhere activated when the car is jacked up , or even spray them with blue security dye.