The problem is not the FBI buying tracking data without a warrant. Police forces don’t need a warrant to ask people what they saw or look at voluntarily disclosed CCTV footage.

The problem is that this data is being collected and aggregated in the first place. Oppression does not get better because you privatise it.

@david_chisnall Eliminating their ability to buy it would hurt the market value of collecting the data in the first place though. It's not a fix, but it's a stab at the economic structure of the problem.