Thoughtcrimes (2003)

"In a fight against crime, her mind is their most valuable weapon."

Freya McAllister suddenly starts hearing voices in her head on the night of her High School Prom. One night Dr Michael Welles arrives telling Freya that she isn't crazy but that her voices are the thoughts of everyone around her. He teaches her to turn her telepathic powers into a powerful gift. What he doesn't say is that he works for the National Security Agency...