30 Days of Night is a 2007 American vampire horror film based on the comic book miniseries of the same name. The film is directed by David Slade and stars Josh Hartnett, Melissa George, and Danny Huston. The story focuses on an Alaskan town beset by vampires as it enters into a thirty-day long polar night. Wikipedia
(upon finding a bag of pot at the sheriff's station) Sheriff Eben Oleson: What the hell is that? Jake Oleson: It's pot. It helps her with her cancer. Helen Munson: Didn't tell you I got a little greenhouse at home. Didn't want you arresting me. Sheriff Eben Oleson: Now I know why you wanted to go live with grandma.