Apparently Jefferson County in Colorado has handed out 19 tickets to mountain bikers for riding wet/muddy trails this season: https://www.9news.com/article/news/at-least-19-people-have-gotten-tickets-this-spring-for-using-trails-closed-for-mud-1-person-left-a-very-angry-note/73-cee6dee6-be7f-4fac-8e22-c6d01287ad40