many of them know that a large number of -- of people that are in the jewelry trade go to a particular place in miami. once they identify that that's a person that they'd like to target then they just follow him, basically, for the entire day and when they have an opportunity and the chance arises, then they'll hit the target. >> here's how the distraction theft worked. the man wearing a yellow shirt and holding a cell phone is watching the target. >> we're guessing that he was talking to the other individuals that were involved in the crime. >> the salesman is detained here as he tries to go through. >> a subject could have possibly been in front of the actual victim and, of course, whatever he had in his pocket set off the machine. at that point the person had to get re-screened once again and that will take two, three minutes sometimes. >> the man in the yellow shirt passes through ahead of the target and is joined by another member of his team.