a) Authorized media on the field: Before the game the home team management
may create a "lined" area that will be designated for photographers,
reporters, etc. If a batted ball or throw enters the area, the ball is dead.
If any media person is outside the area and is hit by the ball, interference
is called. The umpire will judge how to nullify the act, and the person "may"
be ejected.
b) Intentional/accidental – no distinction: If a spectator touches
a thrown or batted ball, the ball is dead even if the touching was accidental.
There is no difference between "touching" (spectator is the active
force) or "being touched by" (the ball is the active force).
c) Touched by pitch: If a spectator is touched by a pitch, the ball
is dead. All runners are awarded one base.
d) Spectator prevents a catch:
i) If a spectator reaches from the stands into the field of play and prevents
a catch, the umpire shall call the batter out. If he judges that after the
catch a runner could have retouched third and scored, he may award the run.
ii) If a fielder reaches into the stands to make a catch, he does so at
his own risk. A spectator hindering that catch shall not be guilty of interference.