That's a good question.
There are many StackExchange sites with overlapping scopes.
Most of the legal experts at the Law StackExchange, will not have dealt with drones law specifically, so they would have to do research to find the answer.
However, many people owning drones will be familiar with the laws that apply to them. So, although there's not yet been a single question on the site because it's brand new, I anticipate that you will get the answer faster here.
Also, more of the users here will be interested in your question about the legality of drones (and its answer) than on the legal stack exchange which deals with divorce law, corporate law, criminal law, international arbitration law, etc., more than it deals with drones law.