если дочитать статью до конца, то там сказано что легально, к примеру
1) Small Folding Knives

a) It is legal to carry a knife that:
folds, but does not lock,
has a blade up to 4 inches, and
is not pointed.

b) It is legal to carry a knife that
folds, but does not lock,
has a blade up to 2.5 inches, and
is pointed.