Once you adopt this mechanism, you will see it in everyone, including yourself. It has actually changed the way I have personal eye to eye conversations with people. It has given me reason to question the validity of others. But most importantly, it has given me cause to question my own motivations many times.
I often catch myself doing it unconsciously. I find it very accurate for myself to determine if I’m stretching the truth, making something up, outright lying, or quoting from vague memory. It has given me cause to intensely practice direct eye to eye contact in every conversation. It works with everyone from my kids to my clients. It gives me reason to let something go, or to question someone further. Further questioning often dissects a lie quite efficiently.
It gives me the opportunity to allow others to catch themselves in a lie, rather than me having to accuse them of lying. I always prefer the former.