New York City bars have been using license ID scanners to keep out underage drinkers. The New York Post reports that the electronic scanners which help filter out fake IDs also supply cops with detailed records of every patron who entered a bar or club on any given evening.
Most recently, the NYPD used the turned-over records of nearly 200 club goers to identify Eric Lee, a Yonkers native arrested for a shooting death.
ID scanners outside of NYC clubs don't just check one's age for admittance. The devices record the names, addresses, and other identification information belonging to patrons. This information is stored and becomes available to police as needed or wanted.
I'm wondering if Canadian privacy laws would allow for a similar tactic?