Learn the signs of lying!
You try to teach your kids from the time they're able to speak that lying is a bad thing to do, especially to you. But it seems to come naturally to them once they figure out that they can stay out of trouble just by fibbing once and again.
Thankfully, lying is a learned skill that most kids don't have. As long as you're knowledgeable about how to pinpoint a lie, you'll have the upper hand with your kids. And we all could use a little help!