Dianne Feinstein actually said...

I can envision drone fights in the air, drones cracking into each other.

I think if you just kept them out of residential areas and maybe with a waiver for police, that might solve the problem.

Is there any reason why a drone pilot should not be certified and licensed?

I know they wouldn't legally carry munitions. But there's nothing to stop someone from arming one with munitions, and that's my big concern.