Ridgefield Emergency Management officials are teaching a drone safety clinic in Wilton next week.  All operators must comply with the National Airspace System rules, regulations, and safety requirements. For instance, any drone weighing more than half a pound and flown outdoors must be registered. It’s a growth industry expected to employ at least 40,000 people over the next ten years.  Participants in the class will learn about those regulations and participate in a flight demonstration.  The drone safety class is being held on May 16th at Middlebrook School Media Center in Wilton.  The cost is $30.