Dina is walking around the store with Bo, sharing some of the resources Cloud 9 has invested in to deter crime. Only half of he cameras are actually function, and the security guard isn’t holding an actual weapon, but potential criminals don’t know that. The goal is to give the illusion that a criminal would be caught.
Part of Dina’s role as head of security involves running the shoplifter rehabilitation program. People who have been caught shoplifting can complete the course to avoid having their crimes reported to the police. Dina tricks them into ripping up their workbooks to determine which of the group is actually interested in the rehabilitation process. This trick is done to separate the group into two smaller groups so she can focus on the ones who are likely to not steal again. This is Bo’s third time falling for the trick.
As Dina and Amy go searching for Bo, Amy notices that Dina doesn’t have a radio in her truck. It turns out that Dina special-ordered her truck without a radio (even though it costs more) because she believes it would make her truck less appealing to potential thieves. If criminals behave rationally (which Gary Becker argued that most do), a truck without a radio wouldn’t be worth the potential cost associated with car theft. Dina has removed the incentive to steal her truck.