Automatic knives, commonly referred to as switchblades, are generally prohibited under federal law and many state laws. These knives are defined by their opening mechanism: a spring-loaded blade that opens automatically with the press of a button, switch, or lever. Variations include gravity knives and ballistic knives. Specific legal definitions and exceptions can vary by jurisdiction, often depending on blade length, opening mechanism, and intended use.
Regulations surrounding these knives stem from concerns about public safety and their potential misuse in criminal activity. Restrictions aim to reduce the risk of accidental injury and deter their use as weapons. Historically, switchblades became associated with certain subcultures and gained notoriety, leading to increased legislative scrutiny. Understanding these regulations is crucial for both knife owners and those considering purchasing any type of automatic knife.