The market is too young for this kind of process. Regulators around the world are smart enough to realise you can't expect drones to follow classic aeronautical design and safety processes right now, you would just stop dead the whole field.

So while they gently introduce such rules (mostly centered around see and avoid for now, also identification), the main way they use to ensure safety is restrict where and who can fly them.

You know they can't be trusted, so you don't fly them above sensitive areas. As processes mature, reliability increase and trust is gained, you will see drones expand the airspace in which they are allowed. It's already happening for BVLOS (beyond visual line of sight) flights which requires a waiver from the FAA in the US (with paperwork such as risk assessment, collision tests on mannequins and so on), as well as specific equipment/processes.

These aircraft are in fact manufactured by a US company (Matternet).