Jones knows the ground rules.

[Forest Ump]

Ground rules for Oriole Park at Camden Yards;

DUGOUT AND PHOTOGRAPHERS' AREAS
Ball striking surfaces, pillars or facings surrounding dugouts: Out of Play.
OUTFIELD AREA
Fair bounding ball striking railing above cement wall down right field line in foul territory: In Play.
Batted ball in flight striking grounds crew shed roof in right field and rebounding onto playing field: Home Run.


Ground rules for all MLB Parks;

The Commissioner's Office has issued the following Universal Ground Rules for use in all Major League ballparks this season. Ground Rules pertaining to individual parks are posted separately in those parks. U.S. Cellular Field, Kauffman Stadium and Yankee Stadium currently do not have ground rules other than the Universal Ground Rules listed below.

Ball on the top step (lip) of the dugout is in play.
No equipment is permitted to be left on the top step (lip) of the dugout. If a ball hits equipment left on the top step it is dead.
A player is not permitted to step or go into a dugout to make a catch.
A player is permitted to reach into a dugout to make a catch. If a player makes a catch outside the dugout and the player's momentum carries him into the dugout, then the catch is allowed and the ball remains alive as long as the player does not fall while in the dugout. See Rule 6.05(a).
A batted ball in flight can be caught between or under railings and around screens.
A catch may be made on the field tarp.
Batted or thrown ball lodging in the rotating signage behind home plate or along first base or third base stands is out of play.
Batted or thrown ball resting on the rotating signage behind home plate or along first base or third base stands is in play.
The facings of railings surrounding the dugout and photographers areas are in play.
Any cameras or microphones permanently attached on railings are treated as part of the railings and are in play.
Any recessed railings or poles that are in the dugout and photographers areas are out of play and should be marked with red to mark them out of play.
Robotic cameras attached to the facing of the backstop screen are considered part of the screen.
A batted ball striking the backstop camera is considered a dead ball.
A thrown ball striking the backstop camera is considered in play.
A ball striking the guy wires that support the backstop is a dead ball.
A ball lodging behind or under canvas on field tarp is out of play.
A ball striking the field tarp and rebounding onto the playing field is in play.
No chairs can be brought out of the dugout or bullpen and onto the playing field.
All yellow lines are in play.