How can you spot a liar?

At times, a person's body language or the way they speak can give clues and reveal more than they are meant to, especially when they're trying to cover something up. But sometimes, it's not so easy to catch on at least, not right away. So, how can you spot a liar? For more, Body Language and Communications Expert, Louise Mahler joins.See omnystudio.com/listener for privacy information.