There has been already such accidents : one in France last year , still investigated by the BEA : Camera drone over a 200.000 crowd music event . Drone malfunction message, pilot lost control on recovery ,fell on crowd , 2 persons injured ,No parachute on that one .
https://www.leparisien.fr/faits-dive...19-8126028.php
One would hope this to be an essential requirement of any trial over populated areas.
One would think so , another good question for our Altitude Angel friend here .