The BBFC rates films to indicate the appropriate age group for viewing. They watch each film in its entirety before assigning a rating. The Exorcist was initially rated X upon its release in 1973, allowing anyone over age 18 to view it. Some local authorities banned it due to pressure groups claiming it was obscene. When reviewed again in 1979 and 1981, the BBFC determined the film did not contain any illegal images and could continue to be distributed with an X rating for audiences over 18.