“Under Hemisphere, the White House Office of National Drug Control Policy (ONDCP) pays telco AT&T to provide all federal, state, local, and tribal law enforcement agencies with the ability to request searches of trillions of domestic phone records dating back to at least 1987, plus the four billion call records added every day.”
Any police agency in the country can ask, often with a subpoena it writes itself, and the searches are not limited to drug cases. The money runs through a Houston drug task force grant, which conveniently dodges a federal Privacy Impact Assessment. The documents are not classified, just stamped “Law Enforcement Sensitive” to keep them out of public view. AT&T sells the Fourth Amendment by the query, and taxpayers fund the purchase.