> Which gets at the real question.. what is the scanner actually checking? That's the question that's been nagging me since the day I read about this particula

> Which gets at the real question.. what is the scanner actually checking? That's the question that's been nagging me since the day I read about this particular mistake. I wonder if there are any active public subreddits of airline workers; somewhere where I could hear a first-hand account of what those scanners are checking.