Keep suspects in the dark
When arresting or detaining a subject, think about what kind of information he or she will be exposed to. If you're placing suspects in your squad car, don't give them the opportunity to learn about the full nature of the investigation. Here are some things to keep in mind:
If you have a computer or radio in your cruiser (as I'm sure most of us do), turn the computer monitor off and turn off or mute the radio as well. This will prevent the suspect from gathering information on the process and current stage of the investigation.