Stingrays are use to intercept calls in real time. They are used by police and foreign intelligence agencies. It allows them to listen in on political calls. Washington DC is a haven for fake cell phone towers.

I found out the LEO in the area I was in had at least one. I saw a police car parked in the area I was in. Very out of place and would only be there if there was a house call. Decided to test the waters, went out side, paced back and forth, and kept talk. His face and body language changed dramatically which let me know he was using a Stringray and I was the current target without a warrant.