Drones should not be hard to jam, but that invites the same problem: disruption to legitimate users. Putting up with police questioning is probably better than losing a drone to a security services induced crash.
From a drone sales website:
But, little do they know that there are many fully autonomous drones out there nowadays. They can do all sorts of smart features without any need of manual controlling. Some of them even feature waypoints mode that allow you to precisely draw a flight path which your drone will follow.