The following states do NOT prohibit auto-open (also referred to as automatic, switchblade or switch knife) for non-law enforcement citizens. Check State Knife Laws for specific details on possession, carry, manufacturer or sale as some restrictions may apply in a specific state. See the list below for blade length restrictions.
California (less than 2″ blade length limitation)
Colorado (effective approximately Aug. 9, 2017; concealed carry maximum length 3-1/2″)