CHARLOTTE, N.C. -- Charlotte-Mecklenburg police questioned a man who flew a drone over Bank of America Stadium during a preseason game earlier this month.

The drone flew over the Panthers-Chiefs game on August 17.

Police said a drone with a camera flew into Bank of America Stadium during the exhibition game. Its operator was detained and questioned before being released and the information was forwarded to the Federal Aviation Administration.

The stadium is under the "Class B" airspace where unmanned aircraft are prohibited, according to the FAA.

Class B airspace is some of the most restricted and includes the sky around the nation's busiest airports, including Charlotte Douglas International, FAA said.

In other spots, though, drone flight still falls into a gray area, one that depends on what you do with the drone. Take Bob Asbury. He flew a drone over Romare Bearden Park, capturing video as I reported this story. If he sold me the video, that's commercial use and the FAA has said that's against the rules.

The other question: What airspace does the FAA control? Down near the ground, not so much. But way up in the air, 400 to 500 feet above, that's airplane territory, regulated by the FAA. Below it, that's also a gray area.

Back down on Earth, Bob Asbury, the drone pilot, says he's waiting for the courts too. He's already shot a lot of video -- none of which he can sell.

"So I'm building my portfolio and when it all sorts out, I'm hoping I can turn my hobby into a little bit of a profit," he says.

He says whoever flew the drone over the Panthers game was in the wrong. "Most people that fly these things are just looking for awesome photographs, from a different perspective."

But as more drones take flight, the rules about exactly what you can do with these things are still up in the air.