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Discover LudwigThe phrase "a lie detector" is correct and usable in written English.
It can be used when referring to a device that measures physiological responses to determine if someone is being truthful or deceptive.
Example: "The police used a lie detector to assess the suspect's honesty during the interrogation."
Alternatives: "polygraph" or "truth verification device".
Exact(49)
Give me a lie detector".
"I asked for a lie detector test.
We could say that the poem is a lie detector.
In February 2000, he passed a lie detector test.
He passed a lie detector test with flying colours.
But Mr. Rivera failed a lie detector test.
Similar(11)
He even passed a lie-detector test.
He agreed to a lie-detector test for Mr. Qahtani.
"Yes, I passed a lie-detector test," the officer responded.
First, a request for Davis to undergo a lie-detector test was rejected.
On the television show he watches the first two contestants ridiculed by a lie-detector.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com