Often when people lie their bodies give them away. In order to successfully know when someone is lying to you, you need to master the art of human lie detection. We can spot a lie with only 54% accuracy. Human lie detectors read facial expressions, body language, voice tone and statement analysis to detect deception. Research has shown that learning human lie detection techniques can help you improve your lie spotting ability up to 90%. 
Human lie detection is like a humanized polygraph. The science trains the naked eye to see guilt, nerves and hidden emotions in a similar way that a polygraph measures heart rate, respiration rate and sweat.
The first step to human lie detection is baselining.
A baseline is how someone acts when they are under normal, non-threatening conditions. It is how someone looks when they are telling the truth. When you want to better read a person’s emotions or spot when they lie, you will need to find their baseline, or notice how they look, sound, act and behave when they are telling the truth. To do this you want to discuss neutral topics.
Step two happens when you suddenly notice a change in baseline. This is called a hot spot area. Like a polygraph picks up spikes in heart rate or sweat, you can pick up on sudden ticks or a jiggling foot that was not there before. Specifically a hot spot area is when you notice someone differs from their baseline. Some cues that indicate a person is lying include;
Opposite Nodding: This happens with nodding. For example, someone will lie and say “yes” but without realizing it, shake their head no.
One Sided Shoulder Shrug:It has been discovered that people have the tendency to slightly lift their shoulder when they lie. It is almost as if they are shrugging because they don’t believe what they are saying.