Tatami (Japanese armour) the other related parts of a full suit of Japanese armour. Collapsible head protection such as "" and other collapsible armor are also "tatami" armor; a traditional kabuto could also be part of a tatami gusoku. Tatami armour was lightweight, portable, convenient for transportation, and they were manufactured inexpensively for the ashigaru light infantry. Tatami armours were worn by all samurai classes from the highest class to the lowest class. The higher class samurai wore elaborate armour while the lower class samurai and retainers wore simpler versions. In his book "Arms and Armor of the Samurai: The History of Weaponry
Body worn video (police equipment) the legitimacy of the organization". Body worn video can potentially have a legitimizing effect on public view of police officers, due to the perception that officers are more accountable for their actions if body cameras are recording these actions. According to research conducted by Cambridge University, more crimes were reported when officers wore body cameras than in control groups in which no cameras were worn. As with all forms of surveillance, bodycams highlight issues of privacy. There are concerns about the privacy of the people being filmed (suspects, victims, witnesses), but also about that of the officers wearing the cameras