Regarding the risk of pilot incapacitation, at least a few factors distinguish this risk from manned aircraft….
The first topic discussed was whether the agency should create a new medical certification category for UA pilots or use an existing certification. The rapid consensus by the group was that the creation of a new certification would be prohibitive for a number of reasons related to the difficulty, expense, and time of initiating any new rulemaking activity.
So says the report called “Unmanned Aircraft Pilot Medical Certification Requirements”, [DOT/FAA/AM-07/3], published by the U.S. Federal Aviation Administration’s Office of Aerospace Medicine in February 2007.
(Thanks to investigator Steven Aftergood for bringing this to our attention.)