I have no doubt this geo fencing data solves crimes and I don't even think it's as bad as e.g. the long surveillance in Carpenter.

The problem is that the police are going to start using like they do with much more precise DNA data, and more innocent people are going to caught in the net.

The bar to convict someone (or, more likely, to convince an innocent person to take a plea deal) is not as high ("beyond a reasonable doubt") as some people think. Get caught apparently contradicting hard data or even a witness and there goes your reasonable doubt.