Gary,

See http://www.sportpilot.org/, it's an EAA website. There's plenty of
information there that'll counter any mis-information you may be
hearing.

Also, it's not in MD, but see Valley Aviation in Winchester, VA, not
far from MD. They've got an Aeronca that they're using for SP
training. And, they're outside the ADIZ in the Shendendoah valley.

Some inside-ADIZ instructors I've talked to would be interesting in
teaching SP, but won't do it there since the complication factor with
Class Bravo and the ADIZ is too high in their view.

-Malcolm Teas