When I was 12, my father and I were kicked out of the Edison Mall in Fort Myers Florida. He was carrying a Rambo 3 bowie and I had a W49 Western bowie. People freaked out and told security. The security guards came up to us, harrassed us and told we could not carry these "weapons" on private property. Yes, malls are considered private property.
That same summer, at a picnic, a Ft. Myers rookie cop put us up against his squad car, took away our knives, frisked us, (I was 12 mind you) and called for backup saying that it was illegal to carry weapons so huge in public. My father, a former Ft. Myers cop told this idiot that it was NOT illegal, and that he should check with his superiors before he was proven wrong. The cop told us to shut up. His backup came over to us, a veteran female police officer, he said he was detaining us for carrying illegal weapons and his partner gave him this look, like the "You moron" look. She had to inform her partner that we were not breaking any laws and that open carry of a knife is totally legal. The buffoon apologized to us but never admitted he was wrong.
That's some of my experience trying to legally carry my knives.