Saturday night, after reading Times columnist Charles Blow's account of his son's detainment at gunpoint by Yale campus police, I was transported back to my own run-in with UCLA campus police in 2009. It was a typically relaxed Sunday evening, and I was headed home from the library. As I passed Ackerman Student Union nearing the bus terminal, I was stopped by an officer. "Do you mind if I check your bag?" he asked. "I do, actually," I said.