you quote a blog that sways into 'big brother government scooping up mass data'
yet if you actually find the source
its more like

'New Orleans' approach, as outlined on the city's website Tuesday, instead directs businesses to create their own method of tracking employees and patrons.'

what you wil actually find is many businesses wont just open the doors. but instead have a reservation system for only a certain number of people to come in at any one time

thus stops people just lingering around a bar for 14 hours a day. where by people only get a 2 hour visit and allow more people in during the day instead of the same group hogging the bar all day