What happens in Vegas stays in Vegas in ways you can hardly imagine.

As you drive into many U.S. casinos, your car plate has been recorded. Your face could also be imprinted on facial recognition technology.

It's how those gambling houses keep track of crimes and spot big spenders.

Now when you walk into many Canadian casinos, the same type of technology looks you over.

But unless you've signed up for a self-exclusion program — a way for gamblers to take a break from gaming — your data is never saved.