Lucas123 writes: Body cameras are the fastest growing segment of the police video camera business. The two largest police body camera manufacturers today — Taser and VieVu — say they've shipped devices to 41% of the nation's 18,000 police departments. But, the hardware is only the basis for the real business: video evidence storage. Last year, Taser's gross profit margins on hardware were 15.6%; the gross margins for video storage were 51%, according to Glenn Mattson, who follows Taser as an equity analyst for Ladenburg Thalmann. "There's no contest. They don't care about making money on the cameras," Mattson said. As of the first quarter of this year, more than a petabyte of police video has been uploaded to Taser's Evidence.com service. Just one of VieVu's clients, the Oakland PD, has uploaded more than a million police videos. The cost of storage, however, is so high that police departments have been forced to determine strict retention policies, that in some cases may effect the long-term handling of evidence. In Birmingham, Ala., for example, where they've deployed 300 cameras and hope to double that this year, the the video cameras themselves cost about $180,000, but the department's total outlay for a five-year contract including cloud storage with Taser will be $889,000.