Runners must complete the marked course; cutting the course = DQ; No outside aid (no pacing by non-competitors, no electronic devices); Course marshals enforce the route; runners must obey marshal directions
Why people argue about this
People often assume that cutting the course is only about avoiding a penalty; they mistakenly believe it's okay as long as you don't get caught by officials. However, the real issue is that cutting the course undermines the integrity of the race and violates the spirit of fair competition, even if no marshal sees it happen.