Here’s a glaring red flag for detecting big little lies. 

The key to spotting a liar is in the details of a person’s story, research published in the journal Nature Human Behaviour suggests. 

If a person’s account includes simple facts like the “who, what, where, when and why,” it’s likely they are telling the truth.

Researchers conducted nine studies with 1,445 people. Each participant was told to determine whether handwritten statements, video transcripts, video interviews, or live interviews about a student’s activities on campus were true or false. 

Accounts came from students portraying a scenario, including one where they steal a test and lie about it.

Another instance followed a mock student wandering around campus and recounting details of their whereabouts. 

Participants were split into two groups.

One cohort were left to determine truth from lies by using their intuition or relying on other factors such as body language like sweating or fidgeting, according to ScienceAlert. 

The other group was told to focus specifically on the details of each mock scenario — including descriptions of people, places, objects, actions, events and timing — and nothing else to determine truth from lies. 

They were also told to narrow in on “the degree to which the message seemed complete, concrete, striking, or rich in details,” according to the study. 

Participants who did this were accurate in telling truth from lies with 59 to 79 percent accuracy, researchers from the University of Amsterdam found.

“Participants performed at the chance level when they made intuitive judgements, free to use any possible cue. But when instructed to rely only on the best available cue (detailedness), they were consistently able to discriminate lies from truths,” researchers wrote.

“Our findings challenge the notion that people lack the potential to detect deception. The simplicity and accuracy of the use-the-best heuristic provides a promising new avenue for deception research,” they continued.

Intuition and attention to detail could trump lie detector tests in some cases, because having too many variables to determine if someone is lying can often cloud someone’s judgement, the researchers determined.

A separate study found that some scientists have found just 75% accuracy when using lie detector tests, proof for why polygraphs are not always a reliable source, Psychology Today reported.