In a previous post (https://cynic.me/diy-weapons-knee-pads-comments/) I’d possibly made an error with respect to the law and so I updated it. The law has to do with spiked wristbands and includes an “any similar device” qualification. The law can be found here:
Not all “spiked wristbands” are illegal though. I have studded wristbands that are protective gear for slingshot fishing, and these are perfectly legal to own, possess, take out in public, and use as intended.
Check the following Bitchute video for more information on spiked wristband laws and protective gear.