<Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> In non-diplomatic usage, referring to someone as persona non grata is to say that the person is ostracized . The person then is, for all intents and purposes, culturally shunned and is figuratively nonexistent . </P> <P> In police circles, this term is often applied to an officer who breaks the blue wall of silence by informing against fellow officers . Examples include Frank Serpico of the NYPD, who in 1971 famously testified against his corrupt fellow officers, and Ted Briseno, who testified against fellow LAPD officers after the Rodney King incident over 20 years later . </P>

Persona non grata means a person who is