The song was released as the third single from the band's third studio album Louder Now.

[3] AllMusic reviewer Corey Apar praised the wordplay between Adam Lazzara and Fred Mascherino, selecting the song as an AllMusic reviewer's pick.

[4] Alternative Press reviewer Scott Heisel said that "Liar (It Takes One to Know One)" is "hands down, the best song on Louder Now.

"[6] The song's music video was directed by Tony Petrossian.

At the end of the video, the figure hooked up to the machine is revealed to be frontman Adam Lazzara, while behind a one-way mirror stands the other band members, who appear to be the ones that gave him the test.