[Nevadaref]

Please stop with the "what if someone gets hurt and they sue the ref arguments." At least for USSF play this is NOT possible. (NFHS maybe)

Take a look at page 17 of the Law book:

Decision 1
A referee (or where applicable, an assistant
referee or fourth official) is not held liable
for:
any kind of injury suffered by a player,
official or spectator
any damage to property of any kind
any other loss suffered by any individual,
club, company, association or other body,
which is due or which may be due to any
decision which he may take under the terms
of the Laws of the Game or in respect of the
normal procedures required to hold, play
and control a match.
This may include:
 a decision that the condition of the field of
play or its surrounds or that the weather
conditions are such as to allow or not to
allow a match to take place
 a decision to abandon a match for
whatever reason
 a decision as to the condition of the
fixtures or equipment used during a match
including the goalposts, crossbar, flagposts
and the ball
 a decision to stop or not to stop a match
due to spectator interference or any problem
in the spectator area
 a decision to stop or not to stop play to
allow an injured player to be removed from
the field of play for treatment
 a decision to request or insist that an
injured player be removed from the field of
play for treatment
 a decision to allow or not to allow a player
to wear certain apparel or equipment
 a decision (in so far as this may be his
responsibility) to allow or not to allow any
persons (including team or stadium officials,
security officers, photographers or other
media representatives) to be present in the
vicinity of the field of play
 any other decision which he may take in
accordance with the Laws of the Game or in
conformity with his duties under the terms
of FIFA, confederation, national association
or league rules or regulations under which
the match is played