Here's a common one: people think that flashing any ID with a date of birth will pass any check. In reality, it's not that simple. Many retailers use digital age verification systems that cross-check your details against official databases, like electoral roll or credit records. They might not even ask for a physical ID if the system confirms your age.

Other times, they'll scan your ID with a special device that reads the chip or barcode. That's because a simple glance at a card isn't reliable—photos can be doctored, and fake IDs are more common than you'd think.

So, don't be offended if a cashier asks for a second piece of ID or runs your card through a scanner. They're just doing their job to stay legal. It's not about doubting you personally.