Well criminals have also changed their methods and are a lot more sophisticated nowadays than they used to be. Cops have to change with the times, just a fact of life.
How would they trace cars used by criminals everywhere? More roadblocks? Then we'd be faced with yet more checkpoints and queues and people would be whinging about that instead.
Gaz
What roadblocks and checkpoints? There hardly any these days, and when there where loads of them about normal crime was alot lower than it is now!!