The obvious answer here is look to the person to your left, to your right in front and behind you. Then look in the mirror.
But for a little education, take a quiz here. (I passed)
This magazine post says it is all in the eyes. Look to the right while answering a question and you are constructing the lie right in front of your questioner. FYI, the article also says that because I used “it is” in the first sentence of this paragraph that I am likely lying. If I would’ve used it’s instead, then you would have a more difficult time detecting my lie.
Be sure to watch the Ted video by Pamela Meyer. Good quote — “Lying is a cooperative act.” You have to participate for it to be effective.