Police impersonation is an act of falsely portraying oneself as a member of the police, for the purpose of deception. In the vast majority of countries, the practice is illegal and carries a custodial sentence.

Impersonating a police officer is sometimes committed in order to assert police-like authority in order to commit a crime. Posing as a police officer enables the offender to legitimize the appearance of an illegal act, such as: burglary, making a traffic stop, or detaining a citizen without resistance.

Dressing up as a police officer in costume (e.g. for Halloween), or pretending to be a police officer for the entertainment purposes or a harmless prank toward an acquaintance is generally not considered a crime, provided that those involved recognize the imposter is not a real police officer, and the imposter is not trying to deceive those involved into thinking they are. Nevertheless, replica police uniforms sold in the UK must not be identical to the uniforms currently used by the police, and traders have been jailed in the past for selling on genuine uniforms.
https://en.wikipedia.org/wiki/Police_impersonation

Policjanci ponownie ostrzegają przed oszustami działającymi metoda na tzw. „wnuczka” czy „policjanta”. - http://www.policja.pl/pol/aktualnosci/178038,Czujna-kasjerka...

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Bogus policeman scam – warning

PARKVIEW – Residents are urged to contact the police immediately if they have been contacted by bogus cops. - https://rosebankkillarneygazette.co.za/200247/bogus-policema...

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Bogus policeman scam strikes AGAIN as cops warn Lincolnshire's vulnerable to be on high alert. - https://www.lincolnshirelive.co.uk/news/local-news/bogus-pol...

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