From: Jack

When mandatory drug testing was implemented as part of all flight
physicals, Bush refused to take his required physical and grounded
himself.

Drug testing is a comman function, not medical. They would not have tested for
drugs suring a flight physical.

Bush was no longer filling a flying slot so no flight physical was required.

Then again, you probably already knew that since you have done such
comprehensive research.

Dan, U.S. Air Force, retired