“Webloc, which is made by a vendor called Penlink, sources data from consumer apps and advertising networks, which collect the location of mobile devices from consumers who download apps or browse the web.”
The ATF bought commercial location data so it could track phones without a warrant. It ran more than 300 searches that way, over 200 tied to active cases, until a judge and a prosecutor balked and forced the agency to get a real court order. This is the standard playbook now. Buy your way around the Fourth Amendment and run it until someone with subpoena power notices.