Falsus in Uno, Falsus in Omnibus Law and Legal Definition
Falsus in Uno, Falsus in Omnibus is a legal maxim which means false in one thing, false in everything. A Roman legal principle indicating that a witness who willfully falsifies one matter is not credible on any matter. The underlying motive for attorneys to impeach opposing witnesses in court: the principle discredits the rest of their testimony if it is without corroboration.
