this is stupid on so many levels and when you read you'll not be surprised when you see where this is being done;

Runners in this weekend’s San Francisco Marathon will need to carry some additional weight, or else they risk having lighter pockets afterward.

Participants in four races must wear masks on some portions of the course, race officials announced in updates to the race’s health protocols over the last two weeks. Stretches of Sunday’s marathon, half marathon and 10K races, as well as all of Saturday’s 5K, are in the Golden Gate National Recreation Area run by the National Park Service, and the agency announced last month masks are required indoors and in “crowded outdoor spaces” on park property amid the COVID-19 delta variant‘s nationwide spread.

Runners who don’t wear masks could be fined by the National Park Service or face disqualification, race officials said. The National Park Service has said visitors who violate the mask requirement on its properties “may be subject to citations as appropriate.”

Julian Espinoza, Public Affairs Specialist with Golden Gate National Recreation Area, told KCBS Radio in an email that the event organizers are responsible for mask enforcement.

Kyle Meyers, Production Director for the San Francisco Marathon, told KCBS Radio’s Eric Brooks runners won’t immediately be pulled from the course, but they could be disqualified if officials get word they weren’t wearing a mask.

“(Those portions) are significantly more congested than the roadways around San Francisco, so we’re just doing our part to help mitigate any transmission,” Meyers said of the race sections on National Park Service property. “We’ll have all of our course volunteers in masks. We actually have signage for mask zones where those end.”.............read more.........