Oklahoma RES IPSA SEQUITUR- INFERENCE OF NEGLIGENCE is a legal doctrine used to prove negligence in a civil case without requiring the plaintiff to provide direct evidence of the defendant's negligence. It is based on the principle that "the thing speaks for itself," meaning that negligence can be inferred from the circumstances of an incident. The doctrine is usually used in cases involving medical malpractice, personal injury, and product liability. There are two types of Oklahoma RES IPSA SEQUITUR- INFERENCE OF NEGLIGENCE: actual and constructive. Actual RES IPSA SEQUITUR- INFERENCE OF NEGLIGENCE occurs when the defendant has done something that demonstrates that he or she was negligent. Constructive RES IPSA SEQUITUR- INFERENCE OF NEGLIGENCE occurs when a jury can infer negligence based on the circumstances of the incident.