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. 

you may fly your drone in the TFR since your company is sponsoring a team at the race. flying your drone is allowed if you notify all non-participating people of the closed course UA operation. the TFR applies to all ...

No, 14 CFR Part 107 only applies to sUAS weighing less than 0.55 lbs. Yes, there is no lower weight limit for operating under 14 CFR Part 107.   No, roof ...

The Administrator, authorized representatives from the NTSB or TSA, or any Federal, State, or Local Law enforcement officers.  The General Public and any Government Employees. Any Government employee.

No Medical Certificates are required. A Class 3 Medical Certificate A Class 2 Medical Certificate.

.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.

Over suburban areas. Over a parade or other social events. Over a sparsely populated area.  

12 hours. 8 hours. 24 hours.

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

Operating your sUAS for an imagery company.   Flying for enjoyment with family and friends. Conducting public operations during a search mission.