For example, imaging you have a suspect and want to trail them. The courts have established that you have no expectation of privacy when in a public area, so an officer can trail your car and watch where you go. You only have so many officers, and so there are implicit limits on how many people you can trail in person. But if instead of sending an officer to trail a suspect, you attach a GPS tracker to the suspect's car, suddenly that restriction is removed. Instead of spending weeks trailing a single suspect, you could attach dozens of trackers to dozens of cars, or you could request location data from a third party. The lower cost of breaking somebody's privacy allows it to be done more frequently, even if the explicit legal protections haven't changed.

The problem isn't the technology itself, but that protections of privacy and protections against unreasonable searches haven't advanced alongside the technology.