FAA Regulation

No more than three as long as the Remote PIC maintains visual line of sight. As many as he/she can handle. No more than one. 

Equip the aircraft with a remote ID broadcast module. You must purchase a new drone to comply with Part 89.  Older drones are grandfathered in and don’t need to comply with Part 89.

An injury requiring an overnight hospital stay.  Minor bruises. Scrapes and cuts bandaged on site.

30 days. 10 days.  90 days.

.04 percent by weight or more alcohol in the blood.   .004 percent by weight or more alcohol in the blood. .008 percent by weight or more alcohol in the blood.

Person manipulating the controls. Remote Pilot in Command (Remote PIC).   Visual observer.

Compliant with Part 107. Part 107 does not apply to this scenario. Not compliant with Part 107. 

It must not contain exposed rotating parts that can lacerate.  It must not contain exposed rotating parts that can lacerate and must not cause injury equivalent to 11 ft-lb of kinetic energy.