A retired Secret Service polygraph examiner with 25 years in the agency has boiled lie detection down to a five-letter acronym anyone can use.
Brad Beeler, who is said to have conducted more criminal polygraph examinations than any other Secret Service agent, laid out the system during an appearance on the outlet Stories. He designed the mnemonic L-I-A-R-S to flag suspicious behavior in everyday conversation, and he unpacked each letter with concrete examples from his career and home life.
Beeler, 25 years with the Secret Service, opened with a core principle about how truthful memories function. “The truth is like a movie reel,” he said. “You can rewind it, you can fast forward it, and when you hit play, you should almost get an immediate response.” He then contrasted that fluency with the mental strain of fabrication: “The problem is on a manufactured story, people have a hard time rewinding and fast forwarding, thinking about what the smells were, what their feelings were because it’s a created situation.”
The first letter, L, stands for latency — the gap between question and answer. Beeler measures this delay as a baseline indicator; the longer the pause, the more likely the respondent is constructing rather than recalling.
I, for incongruence, captures the mismatch between words and physical signals. “Have you ever talked to anybody and you asked them a question and they said yes or no? Is that a problem? Yeah, it’s a problem because I feel like their body’s giving away so much information where it’s like, I can tell you’re not being serious, you’re not being genuine,” he continued.
A marks avoidance, a tactic Beeler distinguished from outright silence. “So it’s not answering the question that you’re asked. You’re getting a response, but you’re not getting an answer.” This evasion pattern, he noted, often surfaces when speakers redirect or offer technically related information that skirts the actual inquiry.
Resistance, the R, manifests as disproportionate offense at being questioned. Beeler flagged this defensive posture as particularly telling — the honest respondent, in his experience, rarely bristles at straightforward curiosity.
The final S covers shifting vocal inflection, which Beeler called a “big time check engine light.” He demonstrated with a domestic example: “Have you been in a situation where you’ve ever asked somebody a question and instead of saying no, like it would have an exclamation part, they said no, like it was almost a question mark, that’s a problem,” He added a specific illustration involving his daughter: “If I ask my daughter, ‘Did you clean your room?’ [and she replies] ‘yes?’ that’s a problem. She didn’t clean your room. Sydney did not clean her room.”
That upward tonal drift at the end of a declarative statement — turning a flat “yes” or “no” into something resembling a question — became Beeler’s signature tell for uncertainty or deception. The pattern, he emphasized, crosses contexts from criminal interviews to household chores.
Beeler built his system through thousands of administered polygraphs, and he has since adapted that institutional knowledge for public consumption. His outlet appearance represents part of a broader trend of intelligence-community veterans translating specialized tradecraft into accessible frameworks for general audiences.
The examiner’s approach deliberately sidesteps the pseudoscience that often surrounds amateur lie detection. Rather than inventing new behavioral tells, he organized established psychological and observational principles into a memorable format that requires no equipment or training beyond attentive listening and timing.
Beeler’s full breakdown of the LIARS method remains available through the outlet Stories platform, where he expanded on each component with additional case context and interpersonal applications.