If you are a black male - You are suspect.

http://www.alternet.org/news-amp-politics/my-family-has-been-racially-profiled-everywhere-harvard-our-own-home

I had my own initiation freshman year at Harvard College. I had just left a matinee movie in Harvard Square and crossed the street into Harvard Yard to rendezvous with friends in Grays Hall (one of the Yard dorms). Suddenly, I noticed a strange sight, a Cambridge police car, with blue lights flashing, driving in the Yard! One of the things a freshman learns upon arriving at school is the unique legal boundaries that envelop most colleges in the United States: all campus buildings and students are policed by the University Police, non-students and the surrounding community is policed by the City of Cambridge Police. As I approached my destination, I surmised that a serious crime must have occurred in Grays Hall for the police to be violating that boundary.
But suddenly I heard the screeching halt of the tires and the metallic disembarkation of the officers and noticed, as they crouched behind their opened car doors, that they had their hands poised above their gun holsters. Now my heart began to race and a fog of disorientation dissolved into the bracing reality that I was the emergency. It was a cold winter day and I had my hands deep in the pockets of my overcoat. The officers barked out their orders for me to, "Take your hands out of your pockets, SLOWLY." As they cautiously approached me I could see the gathering crowd on the steps of Grays Hall watching nervously as the episode unfolded.
The officers demanded my identification. Fortunately, I was carrying my college ID card and was able to prove that I belonged on campus. As they relaxed and began to return to their cars, I had demands of my own. "Why did you stop me?" Dismissively, they tossed a "You fit the description" over their shoulder. There had been a report of an assault by a black man in a white coat in the subway station at Harvard Square. Yes, I fit the description. I was a black man.