http://www.cbc.ca/canada/calgary/sto...-scanning.html
Some bar star takes Tantra's ID scanning policy to the privacy commissioner, and turns out that Tantra is in the wrong. He claimed that it was collecting personal information.
IMO, this is not a good precedent to set. As someone who doesn't cause violence at bars, I would prefer to see them use this system, even if it includes scanning personal information. A sacrifice I'm willing to make to keep troublemakers and re-offenders from ruining my good time.