Legal Topics & Concepts
Explore key legal concepts organized by subject. Each topic aggregates landmark cases, doctrines, definitions, and exam tips — everything you need in one place.
Torts
Negligence
Negligence is the failure to exercise reasonable care, resulting in harm to another. It requires duty, breach, causation, and damages.
Strict Liability
Strict liability imposes liability without fault for abnormally dangerous activities and defective products, regardless of the defendant's care.
Intentional Torts
Intentional torts — including battery, assault, false imprisonment, and IIED — require a volitional act with intent to cause a harmful or offensive contact or apprehension.
Products Liability
Products liability holds manufacturers and sellers liable for defective products that cause injury, through negligence, strict liability, or breach of warranty theories.
Causation in Tort Law
Causation in tort law requires proving both actual cause (but-for or substantial factor) and proximate cause (foreseeability), connecting the defendant's conduct to the plaintiff's harm.
Vicarious Liability
Vicarious liability holds one party liable for the torts of another based on their relationship, most commonly employer-employee under respondeat superior.
Defamation
Defamation protects reputation through claims of libel (written) and slander (spoken), requiring a false statement of fact published to a third party that damages the plaintiff's reputation.
Nuisance
Nuisance law addresses unreasonable interference with the use and enjoyment of land (private nuisance) or rights common to the public (public nuisance).
Contracts
Offer and Acceptance
Offer and acceptance are the foundational elements of contract formation, requiring a definite proposal and unequivocal assent to create a binding agreement.
Consideration
Consideration is the bargained-for exchange that makes a promise enforceable — each party must incur a legal detriment or receive a legal benefit.
Contract Damages
Contract damages aim to put the non-breaching party in the position they would have been in had the contract been performed, through expectation, reliance, or restitution measures.
Contract Defenses
Contract defenses — including mistake, fraud, duress, unconscionability, and impossibility — excuse performance or make a contract voidable when formation or performance is fundamentally flawed.
Constitutional Law
Due Process
Due process under the Fifth and Fourteenth Amendments has two components: procedural due process (fair procedures before deprivation) and substantive due process (protection of fundamental rights).
Equal Protection
Equal protection under the Fourteenth Amendment requires the government to treat similarly situated persons alike, with the level of judicial scrutiny depending on the classification used.
Free Speech & First Amendment
The First Amendment protects freedom of speech from government restriction, with the level of protection depending on the type of speech and the nature of the regulation.
Commerce Clause
The Commerce Clause grants Congress the power to regulate interstate commerce, serving as the primary basis for federal regulatory authority and a limit on state power through the dormant commerce clause.
Separation of Powers
Separation of powers divides federal authority among three branches — legislative, executive, and judicial — with checks and balances preventing any branch from accumulating too much power.
Religious Freedom
The First Amendment's Religion Clauses — the Establishment Clause and Free Exercise Clause — protect religious liberty by preventing government-sponsored religion and protecting individual religious practice.
Civil Procedure
Personal Jurisdiction
Personal jurisdiction determines whether a court has authority over a specific defendant, requiring either consent, physical presence, domicile, or minimum contacts with the forum state.
Erie Doctrine
The Erie doctrine requires federal courts sitting in diversity to apply state substantive law and federal procedural law, raising complex questions about classifying rules as substantive or procedural.
Class Actions
Class actions under Rule 23 allow representative parties to sue on behalf of a class, requiring numerosity, commonality, typicality, and adequate representation, plus fitting into one of three categories.
Res Judicata & Collateral Estoppel
Res judicata (claim preclusion) bars relitigation of claims that were or could have been raised in a prior action; collateral estoppel (issue preclusion) bars relitigation of issues actually decided.
Criminal Law
Search and Seizure (Fourth Amendment)
The Fourth Amendment protects against unreasonable searches and seizures, requiring warrants supported by probable cause with exceptions for consent, exigent circumstances, and other recognized categories.
Miranda Rights & Fifth Amendment
Miranda v. Arizona requires that suspects in custodial interrogation be informed of their right to silence and counsel; statements obtained without Miranda warnings are inadmissible.
Self-Defense
Self-defense justifies the use of force when a person reasonably believes force is necessary to protect themselves from imminent unlawful harm, with deadly force allowed only against threats of death or serious bodily injury.
Mens Rea (Criminal Intent)
Mens rea — the 'guilty mind' — is the mental state required for criminal liability. The Model Penal Code defines four levels: purposely, knowingly, recklessly, and negligently.
Property
Adverse Possession
Adverse possession allows a person to acquire title to land by occupying it openly, continuously, exclusively, and adversely for the statutory period.
Eminent Domain & Takings
The Takings Clause requires just compensation when the government takes private property for public use, encompassing both physical takings and regulatory takings that go 'too far.'
Landlord-Tenant Law
Landlord-tenant law governs the rental relationship, including the implied warranty of habitability, constructive eviction, tenant remedies, and the landlord's duty to mitigate damages.
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