“Falsus in uno, falsus in omnibus” is a Latin term which means “false in one thing, false in everything.”  It in fact is a legal principle in common law that a witness who testifies falsely about one matter is not at all credible to testify about any other matter.  Though this doctrine has been rejected by many common law jurisdictions, but it has survived in some American Courts.  The reason behind abandonment of the said doctrine as a formal rule of evidence is that it has no relevance.  It is now applied as a rule of permissible inference which is basically dependent upon the jury to decide.  But many Courts still apply this doctrine.  Therefore, a witness who willfully gives false statements or testimony, then he or she cannot be credible in any other matter

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