Auckland Airport is lauding its new squad of security officers.
The behavioural detection officers watch out for strange behaviour and have reportedly caught hundreds of criminals.
The group manager of operations at the Aviation Security Service says the officers notice signs others might miss.
Karen Urwin says everyone's met a person who seems strange, but couldn't work out why.
She says experts can quantify all the little things we pick up subconsciously, which tell us something is wrong.
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