Want to know if someone is telling the truth? Let's take some tips from airport screeners.

The main method TSA uses, called Screening of Passengers by Observation Techniques (SPOT) involves a list of 94 signs of anxiety and fear, like lack of eye contact or sweating. Interestingly, one report found that SPOT is ineffective, only slightly better than random chance.

Another method of screening is simply to talk to suspects. Open-ended questioning—known as the Controlled Cognitive Engagement method (CCE)—is 20 times more effective than trying to monitor based on behavior. In this approach, the agent just "chats" with the passenger, asking random open-ended questions like "Where did you go to college? What did you major in?"

In the study, officers using conversation-based screening caught 66% of deceptive passengers, compared to just 3% who used behavior-based screening.

Now, doesn't this give us food for thought? Let's think of our bids as random, conversation-based questions, and see if we can spot the guilty party! Today we're going to respond to Pard's limiting bids. Pard will have made a bit that shows his shape and limits his points. We will "Do the Math" and make the final decision.