A trio of film creators has been hitting the streets, the courts, the jail and public officials’ offices, asking questions about Northern Kentucky’s heroin problem. Lucy Treadway, a Los Angeles freelance producer and director, Ameer Mabjish, a public defender for Kenton County, and Julian Starks, a Los Angeles filmmaker and Mabjish’s uncle, are in town making “the heroin documentary,” an as-yet untitled film.