監視カメラ
The market for using security smoke as a theft prevention tool came about because of an increase in the ability of thieves to circumvent existing physical security measures, often by simply raising the level of violence utilised to gain entry. Burglar alarms often have a delay of several minutes before police or private security are able to respond, meaning a well organised criminal has a period of time in which to enter and take what they like. Closed-circuit television and recording devices have been nullified as thieves routinely hide their identities. The security smoke market developed as an alternative security method, designed not to deter entry, but to prevent loss if a thief did gain access.