The Miami-Dade Police Department (MDPD) is scrapping plans to test persistent aerial surveillance technology following criticism from privacy advocates. This kind of technology has prompted privacy concerns in others cities, with Baltimore being perhaps the most notable. One of the best-known aerial surveillance companies allows users to keep a roughly 25 square mile area under surveillance and comes with ?Google Earth with TiVo? capability, The news from Miami-Dade county. while reassuring, underlines a number of issues concerning federalism, privacy, and transparency that lawmakers must tackle as aerial surveillance tools improve and proliferate.