BAFA Rules Committee
The original rule can be found here. Some rationale for the change can be found here.
ARTICLE 1. The minimum medical facilities during a game are:
a. A qualified medical practitioner, nurse, paramedic, physiotherapist or first aider must be available.
b. A first aid kit including a suitable (preferably inflatable) set of limb splints must be available.
c. A stretcher must be available.
d. An ambulance and crew must be available . An ambulance is defined to be a vehicle constructed and equipped for the purpose of carrying stretcher-bound patients to hospital. (A.R. 1-5-1:I-VIII)
e. A telephone capable of use to summon the emergency services
should be available.
NOTE: Available means inside or immediately outside the stadium and fit for use (Exception: An ambulance and its crew are defined to be available at a game even though they may be absent from the stadium in the act of transporting someone to hospital.)