If they're getting nervous, you're getting hot
On interdiction stops, remember that the driver or others who were in the car you’re searching can be excellent indicators of whether you’re getting close to finding something. Have a back-up officer keep a close eye on the behavior of the suspects while the search is being conducted. Were they calm and collected while you searched the interior but suddenly got fidgety and tense when you headed for the trunk? Were they talking with each other while you were searching the driver’s seat area but obviously clammed up when you walked around to the passenger side? A change in behavior could potentially be a sign that you’re on target. If they're getting nervous, you're getting hot.