How Can This Be Stopped?
Even if we pass air tight laws governing the use of the cell tower honey pots, how can this cannot be enforced? Even if all the equipment has an black box that records when and where it was used and the data that is collected, the tech is already "out there". This would be as fruitless as banning guns.
Regarding the info they collect, they might not be able to use the initial information they gather as evidence but once they smell something interesting, then they'll follow the rules and eventually legally obtain evidence.