A 20-year-old college student in California said he was shocked to discover he has been followed by the FBI when earlier this week he found a GPS tracker placed underneath his car. Yasir Afifi, a half-Egyptian, half-American Muslim and U.S. citizen, said he was having the oil changed on his car last Sunday at a Santa Clara, Calif., auto shop when he noticed a wire and the black device underneath the automobile as it was being raised. "I was born here in Santa Clara, I just turned 20 last August. I'm a sales manager, we sell laptops and I'm a...