Verbod op dragen gebruiksmessen in heel Amsterdam vanaf 1 juli

So I'm not allowed to walk around with my pocketknife anymore. I don't have it on me every day, but when I'm outside the whole day I usually do, for e.g. making lunch and what have you.

I know practically it shouldn't matter, as the police cannot search me, but in theory I'm now doing illegal stuff when I have it on me.