Let's play "count the people listening to your call"

News from The Associated Press

To keep the program secret, investigators who request searches of the database are instructed to "never refer to Hemisphere in any official document," one of the slides noted. Agents are told that when they obtain information through a Hemisphere program subpoena, they should "wall off" the program by filing a duplicative subpoena directly to target's phone company or by simply writing that the information was obtained through an AT&T subpoena.