picture and with a click send it directly to police dispatch. >> this guy was acting aggressively are rocks. >> reporter: most of the 150 reports so far are far more tame. >> panhandling, vandalism, that type of thing. >> drunks, drugs, homeless, sleepers. >> reporter: that's the joy of involving incidents on the train. >> reporter: before the app riders had to find a cop or conductor or get on the train intercom to make a report. >> i think anything that increases safety and makes you feel safer about using bart and public transportation is a good thing. >> reporter: not everyone, however, agrees, like the american civil liberties union, for example. >> perfectly legal and constitutional behavior is going to get swept up into law enforcement databases. >> reporter: they are worried that bart will keep a slide show of protestors, panhandlers, or even people just going on a train. the other concern is privacy for the person using the app. >> there's all kinds of ways that bart will be able to sweep up sensitive information.