"You can use facial action coding, heart rate, and eye and retinal changes of any size to determine deception," says Nickerson, who used the example of facial recognition coding systems being used in casinos in Las Vegas to sniff out cheaters at the tables or to keep them out of the building entirely. "Law enforcement in Vegas can take generic images of people and use real-time monitoring in casinos for those threats," he adds.
Some experts argue that facial recognition has a long way to go; those trying to keep a low profile can simply pull down their hats or cover their faces, while verification systems can easily be fooled by a picture of a person's face.
Hauhn used the example of how law enforcement in Florida used video surveillance with facial recognition of everyone who had warrants in the state when it hosted the Super Bowl some 10 years ago. He claimed that there were thousands of false positives, but Nickerson maintains that despite its flaws, the technology is advanced enough to be trusted.
"In terms of both surveillance and monitoring entry points, it has exponentially improved the amount of control and accuracy we have," says Nickerson.
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