What You'll Learn

  • Why consent is a privilege 4. Capacity, mistake, fraud, and duress
  • Actual and apparent consent 5. Scope and revocation
  • Presumed and emergency consent

Educational information only; not legal advice. This article is a general study aid and should be checked against current authority and course materials.

The plaintiff was subjectively willing and authorized the conduct expressly or through conduct.

The defendant reasonably believed the plaintiff consented based on outward behavior.

Prevailing social norms justify the contact when the defendant has no reason to believe the plaintiff would object.

Immediate action is reasonably necessary to prevent greater harm, and actual consent cannot be obtained in time.

Key Takeaway

The plaintiff's conduct at a vaccination line could reasonably communicate consent. Apparent consent focuses on what the defendant reasonably understood from outward behavior.

Requirement Question

Capacity Could the plaintiff appreciate the nature, extent, and potential consequences of the conduct?

Freedom from duress Was authorization the product of coercion or an improper threat?

Freedom from substantial mistake Did the plaintiff misunderstand the nature of the invasion, expected harm, or the actor's purpose?

Subjective willingness Did the plaintiff actually agree, or is the defendant relying only on silence or assumption?

3. Fraud Can Invalidate - but the Subject Matters

Fraud about the essential character of the contact can defeat consent. Misrepresentation about a merely collateral matter may not. The key question is whether the deception changed what the plaintiff understood she was authorizing.

Key Takeaway

Consent to the presence and assistance of a supposed medical helper could be invalid when the defendant concealed that the person lacked the represented role or qualifications.

Medical treatment without authorization can constitute battery when the provider performs a procedure outside the agreed scope. An emergency can imply consent only when immediate action is reasonably necessary, there is no time to obtain consent, and the provider has no reason to believe the patient would refuse.

Key Takeaway

Operating on a different ear from the one authorized illustrated that beneficial intent does not substitute for consent when the procedure exceeded the permission given.

5. Scope, Conditions, and Revocation

Scope: consent to one kind of contact does not authorize materially different conduct. Conditions: the plaintiff may limit time, place, method, participant, or degree of force. Revocation: consent can be withdrawn before or during the conduct when withdrawal is communicated. Sports and other activities: participants consent to conduct within the rules and ordinary expectations, not every intentional injury.

Key Takeaway

Participation in a violent sport did not necessarily authorize an intentional blow outside the game's accepted scope. Consent tracks the activity actually undertaken.

The outlines emphasize that absence of resistance is not itself consent, consent to one act does not imply consent to another, and communicated unwillingness defeats authorization. Conflicting evidence about consent is ordinarily evaluated by the factfinder.

Key Takeaway

A patient consents to removal of a benign cyst from the left arm. During the procedure, the physician removes an unrelated mole from the right shoulder without emergency necessity. The additional contact may exceed the scope of consent even if the physician believed removal was beneficial.

Common Mistake

Do not ask only whether the plaintiff said yes. Ask what was authorized, whether the authorization was valid, and whether the defendant stayed within its scope.

Primary Authorities

  • Restatement (Third) of Torts: consent and substantial-mistake principles as summarized in the outlines.

  • O'Brien v. Cunard S.S. Co. (apparent consent).

  • Mohr v. Williams (medical treatment outside scope).

  • Hackbart v. Cincinnati Bengals, Inc. and De May v. Roberts.

Exam-ready conclusion

Consent is conduct-specific. A valid privilege requires capacity, voluntariness, and authorization broad enough to cover what the defendant actually did.