Requirements for Res Ipsa Loquitur
(1) There must be no direct evidence of D's conduct in connection with the event;
(2) P must demonstrate that the event is of a kind which ordinarily does no occur except through the negligence of someone else.
(3) P must show that the instrument which caused her injury was, at the relevant time, in the exclusive control of D.
(4) P must show that her injury was no due to her own action.
*Some (very few) courts have purported to hold that P must also show that a true explanation of the events is more readily accessible to D than to herself.