there are some of the strategies on how to detect liars using different techniques:
ask unexpected questions
pay attention to the speech rate and amount of words
ask the liars to tell the truth in reverse order
pay attention and observe.
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Interesting tips, thanks for sharing.
Something else to be mindful of is clusters of behavioral changes in gesticulations or body language that might indicate stress.
Where the public perception fails (as well as investigators) is attributing too much to one sign. For instance, eye avoidance was for a long time assumed to be the ultimate sign of deceit. However, for those on the autism spectrum as well as many with anxiety, eye avoidance might be more about comfort.
That's why the work of Ekman and others in non-verbal cues to deceit will look for a cluster of signs to indicate stress. Alongside this, careful interview techniques will involve going back to a certain line of questioning to see whether the same clusters reveal themselves.
In personal relationships, it's wise to give the benefit of the doubt as accusing someone of lying and being wrong can do irreparable damage to the relationship.