If a person is lying their expressions, mostly micro expressions might change. For eg., if someone says they’re not angry but their face might show it.
When someone is lying, they give excess information to make the story believable.
While lying, people sometimes say things that contradict their previous statements. Through this you can decide if they’re lying or not.
People often get inconsistent in their “Storyline” when lying. This can help to spot who’s lying and who’s not.
When lying, people’s voices often become high pitched as they get nervous or stressed.
People often fumble, i.e., they are more likely to use “uhh”, “umm” words while lying.
When lying, we can often see their body language changes and some avoid making “eye contact”.