The Trail 6 area near Camp Pendleton has drawn nudists for decades. A 1979 state law allowed nudity if it wasn't offensive.
But in 2010, after getting reports of adult films being made there, state park rangers started citing naked beachgoers.
Now, according to the San Diego Tribune, a group called the Naturist Action Committee is challenging the charges.
So far, the paper reports, the group has gotten 11 cases dismissed by asking for jury trials.
Prosecutors say they don't have enough resources to bring nude sunbathers to trial.