Dripping Springs resident Nathan Kaspar knows his way around the Americans with Disabilities Act (ADA). “I grew up around it,” says Kaspar, whose mother’s sister was born blind.

He’s also a disabled veteran of the Navy with 24 years service, and has DV designated license plates, so he’s equally familiar with what that status allows him.

So it was somewhat of a surprise when, after County Judge Ruben Becerra issued an order requiring “all people” age 10 and...