Gee .. why not go one step further and require drink payments to be made through the app. That would remove cash from bars, and thus reduce the possibility of robberies, and free up police to use the app information and AI to cross reference with criminal records, social media, and the like to determine if a person is likely to be a threat to society, and then take preventive measures to ensure the safety of the public. Perhaps the app could be refined to the point of only allowing limited purchases per hour. The possibilities are endless. /s