For me, the person I supervise always starts a lie with 'To be perfectly honest...' and I know that what's coming next is complete BS.
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If they’re overthinkers, they’ll give too much detail. If they aren’t, they won’t give enough.
I think I'm a bit intimidating myself, so people reveal their lies themselves. When someone tells me what happened and takes a break, I don't say anything, I look expectantly into the eyes and ask, and then? If someone lies, the expressions and body language change and the other person becomes nervous. Sometimes I myself am a little startled by the stuttering and nervous reaction of others. Hey, this isn't a police interview. In order to lie, you have to develop a pretty detailed lie, and apparently many people don't think it through completely. At the point when I ask about the details or ask follow-up questions, the deal is sealed. By the way, I'm a really bad liar myself and even white lies have to be based on partial truth and maybe that's why I can see when I'm being lied to.
Watch the body language. Not the face mimic or the eyes - these are controlled by neocortex and are very good at faking. Watch if the rest of the body (especially feet, but hands and neck too) display any of the so-called "calming behaviors" (rubbing hands or neck, excessive sweat, extra movement of the feet, "closed" body position etc.)
Note that this is not 100% accurate - someone might show signs of anxiety because he is late, or because he parked in a restricted area - so context is super important.