I just got a P3S and have looked online to see if I can fly in State Parks in Maryland. I read throught the thread here and don't see anything that stands out for Maryland. Anyone have additiional info?
Currently, Maryland Dept. of Natural Resources (DNR), which runs the state parks, has no regs on the books, so it isn't technically prohibited. They've said in the past that they were working on regs, but that seems to have bogged down.
Still, I would use a great deal of discretion, choose my park wisely, and pack up if asked to stop. Otherwise, it contributes to the potential for broader regulation that shuts us down completely.
Also, in 2015, Maryland enacted the following bill, which prohibits counties and cities from restricting UAV flights:
http://mgaleg.maryland.gov/2015RS/Chapters_noln/CH_164_sb0370e.pdf
As a result of that bill, MD Code, Economic Development, § 14-301(b) now provides:
"Only the State may enact a law or take any other action to prohibit, restrict, or regulate the testing or operation of unmanned aircraft systems in the State."
The "any other action" language implies it would prohibit enforcement of existing regulations on anything other than a state or federal level. For example, MNCPPC (which isn't the state, per se) has a prohibition on powered model airplanes. I doubt they can lawfully enforce it under that statute.