Two people are selling the same broken phone. A buyer asks the first one, “So what can you tell me about it?” The seller says it works great.
The buyer asks the second one, “What problems does it have?” The seller admits everything.
Same product. Same defects. Same kind of person. The only variable was the wording of the question, and researchers have measured exactly how much that changes the answer.
Start with an uncomfortable statistic. According to a study from the University of Massachusetts, around 60 percent of people cannot get through ten minutes of normal conversation without telling at least one lie.
That does not make everyone a liar. It does show how routine small dishonesty is in ordinary communication.
And most of us never call it out. We sense something is off, we suspect we are not getting the whole story, and we say nothing, because social rules, politeness, and plain uncertainty make direct accusation almost impossible.
So the useful question is not how to catch a liar. It is how to make honesty more likely without any confrontation at all.
First, throw out what you think you know about spotting lies.
The popular idea that someone glancing up and to the left is lying does not hold up. Research shows lie detection is far more complicated, and reading any single behavior is unreliable.
What scientists point to instead is the question itself.
A study from the University of Utah tested exactly that. Participants were placed in a scenario where they had to sell a used electronic device that they knew was faulty, and buyers approached them with differently worded questions.
Version one: what can you tell me about the device. Only a small number of sellers admitted to any problems. Most simply never mentioned the defects.
Version two: it does not have any problems, does it. Honest answers rose significantly.
Version three: what problems does it have. Now the majority of sellers openly confessed.
The pattern is unmistakable. The more specific and assumptive the question, the more truth comes back.
The reason is psychological. When your question assumes information already exists, it signals to the other person that the truth is expected and might already be known, which strips away their room to dodge. A vague question does the opposite, handing them space to deflect, downplay, or quietly leave things out.
General questions make hiding easy. Targeted questions make honesty the safer choice. This is not manipulation. It is removing the comfort of ambiguity.
You can use this anywhere. Interviews, negotiations, difficult conversations at home. Skip the open ended and overly polite phrasing and address the specific issue directly.
And if you already suspect someone is lying, there is a second technique worth knowing. Rather than accusing them, ask for detail. Make them explain the story fully, because the more details they supply, the more chances you have to notice inconsistencies and gaps.
The takeaway reframes the whole problem. Truth is not really about detecting lies after they happen. It is about shaping the conversation so that honesty becomes the path of least resistance.
No method works every time. But the way you phrase a question matters far more than most people ever realize.
