@davew An exception to this rule: if you can counter their lies with factual information then you may stick around and ask further questions. Gotta be good at this though, if someone's willing to tell a lie then they're going to be slippery and try to evade.
Yes, I know, this is just gotcha journalism you might think but no, just regular investigative journalism here, sorry that the questions aren't going easy on you. Stop lying and they'll stop.