patrick revins , 49 , sold £ 10-worth of the class a drug , was hidden in a kinder egg , to the policeman in november 2013 .
the detective was easily able to identify who sold him the drugs - as revins has ` p ' and ` r ' - tattooed on either side of his forehead .
revins , at stoke-on-trent crown court yesterday , admitted one count of supplying heroin and was sentenced to a year in jail .