New legislation has been passed in Puerto Rico. The knife laws are the same. there is no length law on knives in Puerto Rico. I've read this misnomer many times. You're allowed to carry a knife for work sport art or if you're defenseless. But the gun laws have changed $200 for a license . used to take a year.And it used to cost about $2,000 with a lawyer and all of this bureaucracy that denied us our second amendment thanks to the NRA laws have changed. Also if you have a concealed weapons permit from another state it's honored in Puerto Rico. I didn't think I'd see the day. But back to knives. There is no length law. It's not written in the law. This is my first post thank you very much for your responses.