Bricks gets absolutely stupid any time drugs (read: uki) is involved. Prim please smack him upside the head so all the uki falls out. Also crimes are! Totally normal! A normal thing! Everyone does a little crime now and then RIGHT...? when you're a penderyn you get away with it a lot easier too

I'd be super delighted about him learning since that is a secret being kept from him in canon (and probably will be for a long time)!