In 1914, Chicago amended its film censorship ordinance, setting up a category of films approved for showing only to persons over twenty-one (the first example of a rating system in motion-picture exhibition). The police were authorized to give such films "pink permits".
In 1914, Chicago revised its film censorship law, establishing a category of films suitable only for individuals aged twenty-one or older (the initial rating system in movie screenings). The police were permitted to issue such films "pink permits".