The Federal Aviation Administration (FAA) said that final rules announced in December took effect on Wednesday allowing for small drones to fly over people and at night, a significant step toward their eventual use for widespread commercial deliveries.The effective date was briefly delayed during the change in administration. The FAA said its long-awaited rules for the drones, also known as unmanned aerial vehicles, will address security concerns by requiring remote identification technology in most cases to enable their identification from the ground.