If you’re forced to take a lie detector test then you’re probably not in the best situation to begin with, and if you’re going to try and beat it then you’re definitely in a bad situation. It’s good to know that there is a way out though.

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This method is championed by a guy called Doug Williams, who joined the police force in Oklahoma in his 20s and then went to polygraph school in New York – so he’s a bonafide expert on the subject. Here’s how to beat it:

I began to have doubts in the tests after a while. I knew how to intimidate people to get the results I wanted.

The more heinous the crime, the more likely an innocent will fail. After all, even the accusation of a serious crime is bound to induce the sweats and get your pulse up.

I knew I could control my breathing but I didn’t know for sure how to control the cardio and the blood pressure.

It wasn’t until my friend came in and started talking about the pucker factor and tightening up the anal sphincter muscle when he was under stress.

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So there you have it – if ever you need to try and beat a polygraph test, then all you need to do is clench your butt and you should be cool. Hopefully you’ll never have to use that information, but it’s good to have it stored in the back of your head somewhere.

For more lie detectors, check out a bunch of people hooking up their exes to a lie detector and reaping the consequences. Brutal.