That law is just plain silly. No matter how it opens, a knife is a knife is a knife.
Screw driver, ball-pein hammer, roll of quarters in a sock, metal case ballpoint pen, Chop stick, 3/4” Sched 40 PVC cut at acute angle, 1/4” rebar, tent peg, Baseball bat, Cricket bat (”It’s for a cross-cultural show & tell at school, officer.”), icicle made with cloth, etc, etc, etc.
Repeat after me, Liberals/Progressives, “Objects don’t murder people, people murder people.”
Liberals are fond of quoting “The Pen is mightier than the Sword”, yet refuse to acknowledge that their regulations have harmed more people that pocketknives, etc.
I had a Case double-blade pocket knife in the first grade. We’d play “mumbly-peg” at recess. All the boys had either a Case or a Barlow.