![]() Now imagine that you are screening IDs for airport security. A bouncer for a college bar can likely expect to catch roughly a dozen fake IDs in an evening, and the cost for missing one is relatively low: an underage student sneaks into a bar, and the bar makes more money. Detecting false IDs is surprisingly difficult, especially when they rarely occur. It turns out, however, that this intuition is wrong. Look at the photo, look at the person, and they either match or not. Despite all these challenges, intuition probably tells you that matching faces to ID photos is easy and accurate. And because the patrons are dressed for a night out, many of them look somewhat different than their ID photos. It is somewhat dark outside the door, there are many distractions: loud music is playing and your job requires you to also keep an eye on the crowd for trouble. Imagine that you are a bouncer, checking IDs outside a popular bar in a college town.
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