Issue Briefs Subject(s): Courts & Judicial Published: November 28, 2018 Agency: Legislative Council Staff Gravity and switchblade knives, which were originally popularized by classic movies such as West Side Story and Rebel Without a Cause, are considered illegal weapons in Colorado. Possessing such a weapon could result in a fine or jail time, or both. This issue brief provides an overview of Colorado law and legislative history concerning switchblades and gravity knives, as well as the laws in other states. Download Document