People often mix this up with negligence per se, but they are not the same. Negligence per se means someone violated a safety law or rule, and that violation can help prove they acted unreasonably. Res ipsa loquitur is different: it lets a court infer negligence from the way an event happened, even without a witness who saw the exact mistake. The classic idea is simple - some accidents usually do not happen unless somebody messed up, and the thing that caused the harm was under the defendant's control.

Practically, that matters when the evidence is mostly in the defendant's hands. In a medical setting, a patient may wake up with an injury nowhere near the surgical site, or a foreign object may be left inside the body. In that kind of case, res ipsa loquitur can help bridge the proof gap. It does not guarantee a win, and it does not replace proof of damages, causation, or who controlled the instrumentality. But it can keep a claim alive when common sense strongly points to a preventable error.

In Indiana, medical malpractice claims are also shaped by the Indiana Medical Malpractice Act and the medical review panel process. That means even if res ipsa loquitur may apply, deadlines and panel rules still matter. Use it as a proof tool, not a shortcut around the rest of the case.