We have a boat in a marina in Canada directly outside of a family-owned ocean-front apartment. The local waterfront serves as a commercial centre, an airport to sea planes (that often awake us in the morning), and boaters of all kinds. You do not want these people stoned. Even the paddle boarders and canoe folks are in these busy pathways on the water. I get it. I get the law stating that operators of boats/paddle boards, whatever etc. be drug and alcohol free, but the pot laws for passengers? That kills parties right there. 
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