Learn two simple questions that can encourage honest, detailed answers and help you notice inconsistencies without relying on unreliable “lie detection” tricks.
Everyone tells a small lie from time to time. But when you genuinely need to understand whether someone is being truthful, it can be tempting to look for obvious signs such as avoiding eye contact, fidgeting, or speaking nervously.
The problem is that none of these behaviors proves someone is lying. People can become nervous when they’re completely honest, especially when they feel accused or under pressure.
Instead of trying to “catch” someone through body language, a better approach is to ask questions that encourage them to explain their version of events clearly.
1. “Can You Walk Me Through Exactly What Happened?”
This is a powerful open-ended question because it doesn’t suggest the answer you’re expecting.
Rather than asking:
“You were there at 8 p.m., weren’t you?”
try:
“Can you walk me through what happened from the beginning?”
Give the person an opportunity to explain the situation in their own words.
A truthful person may remember some details clearly and be uncertain about others. That’s perfectly normal. Human memory isn’t a recording, and people can genuinely forget times, names, or small details.
What can be more informative is whether the overall story remains reasonably consistent when discussed again.
Pay attention to the explanation—not just the behavior
Someone who is nervous isn’t necessarily dishonest. Instead, listen for things such as:
- Major changes in the story
- Important details that contradict earlier statements
- Explanations that don’t fit the known timeline
- Claims that become dramatically different after being questioned
One inconsistency alone doesn’t establish deception. There may be an innocent explanation.
2. “What Part of Your Story Are You Least Certain About?”
This question is particularly useful because it gives the person permission to acknowledge uncertainty.
People sometimes believe that an honest person should remember everything perfectly. That’s not true.
Someone might say:
“I’m sure I left after dinner, but I’m not completely sure whether it was 8:30 or 9.”
That kind of uncertainty can actually be perfectly normal.
On the other hand, someone who insists that they remember every tiny detail with absolute certainty shouldn’t automatically be considered a liar either. Some people simply have strong confidence in their memories.
The key is to compare what they say with independently available information, when appropriate.
Why These Questions Can Help
Open-ended questions encourage a person to provide information without giving them the answer.
For example, compare these two approaches:
Leading question:
“Did you go to the store at 7?”
Open-ended question:
“What did you do after you left home?”
The first question gives the person information about what you’re expecting. The second allows them to provide their own account.
That’s why open-ended questioning is generally more useful when you’re trying to understand what actually happened.
Don’t Fall for the “Eye Contact Test”
One of the most popular myths about lying is that liars avoid eye contact.
In reality, eye contact varies tremendously between people and situations. Someone may look away because they’re thinking, embarrassed, anxious, distracted, or simply uncomfortable.
Likewise, someone can maintain eye contact while telling a lie.
The same applies to:
- Touching the face
- Crossing the arms
- Fidgeting
- Speaking quickly
- Pausing before answering
- Looking nervous
These behaviors can have many explanations.
Look for Patterns, Not a Single “Tell”
If you are genuinely concerned about whether someone is being truthful, consider the entire conversation.
Ask yourself:
Does the story make sense?
Are the events logically possible?
Does the timeline fit?
Do the claimed times and locations make sense?
Does the story remain broadly consistent?
If the person explains it again later, are the major facts still the same?
Is there evidence that can be checked?
Messages, receipts, timestamps, photographs, or other records may be much more useful than body-language guesses.
Give People Time to Answer
Another useful technique is simply to avoid rushing to fill silence.
Ask your question and allow the person to finish their answer.
If they pause, don’t immediately repeat the question or suggest possible answers.
For example:
“What happened after you left?”
Then wait.
A pause doesn’t mean someone is lying. They may simply be remembering events or choosing their words carefully.
The Most Important Rule
These questions aren’t a magical “lie detector.”
There is no guaranteed two-question formula that can determine whether somebody is lying. Even trained professionals can make mistakes when judging deception from behavior alone.
The goal should be to obtain a clearer account, identify genuine contradictions, and verify important claims when possible—not to label someone dishonest simply because they appear nervous.
Sometimes the strongest evidence isn’t a facial expression or a nervous gesture. It’s whether the person’s explanation remains consistent with the facts.