U.S. law is organized into several branches, and examples of law in each one look very different depending on who is suing whom and what’s at stake. Criminal law punishes conduct the government treats as harmful to society. Tort law lets injured people recover money. Contract law enforces promises. Property, employment, family, intellectual property, constitutional, and administrative law each govern their own slice of daily life. The sections below walk through each branch with concrete examples so you can recognize which one applies to a situation you’re facing.
Criminal Law
Criminal cases are brought by a prosecutor on behalf of the state or federal government, not by the victim. The penalties can include prison, fines, probation, and a permanent record.
Felonies are the most serious offenses. Under federal law, first-degree murder carries life in prison or death, and second-degree murder can bring any term of years up to life.1Office of the Law Revision Counsel. 18 USC 1111 – Murder Federal robbery, defined as taking something of value from another person by force or intimidation, carries up to fifteen years.2Office of the Law Revision Counsel. 18 USC 2111 – Special Maritime and Territorial Jurisdiction That particular statute reaches only places under special federal jurisdiction, like military bases and national parks; most robbery prosecutions happen under state law, where penalties vary.
Misdemeanors sit lower on the scale and cover offenses like simple assault or petty theft, with shorter sentences. Some lower-level felonies can also result in a jail term of a year or less when a judge finds a longer sentence too harsh for the circumstances.3New York State Senate. New York Penal Code 70.00 – Sentence of Imprisonment for Felony
White-Collar Crimes
Not every serious federal charge involves violence. Mail fraud and wire fraud are among the most commonly prosecuted white-collar offenses. The government has to prove the defendant devised a scheme to defraud and used the postal service, a commercial carrier, or electronic communications to carry it out. A standard conviction can bring up to twenty years in prison, and if the scheme targets a financial institution or exploits a federally declared disaster, the ceiling rises to thirty years and a $1,000,000 fine.4Office of the Law Revision Counsel. 18 USC 1341 – Frauds and Swindles
The Burden of Proof
In every criminal case, the prosecution has to prove each element of the offense beyond a reasonable doubt. That is the highest standard of proof in the legal system. If a juror has any reasonable uncertainty about guilt, the duty is to acquit. This standard is what separates criminal cases from the civil branches below, where a party usually only has to tip the scales slightly in its favor.
Tort Law
Where criminal law punishes, tort law pays. A tort claim doesn’t send anyone to jail; it compensates the injured person for medical bills, lost income, pain, and similar losses. Most tort cases rest on one of three theories.
Negligence
Negligence is the most common tort. You prove it by showing that someone owed you a duty of care, breached that duty, and caused your injury as a result. A grocery store that ignores a spill for hours until a customer slips and breaks a wrist is a textbook example. The store had a duty to keep conditions safe, it failed, and someone got hurt.
Your own conduct also matters. Most states follow comparative negligence, which reduces your compensation by whatever percentage of fault a jury assigns to you. If you are 30% at fault, you collect 70% of your damages. Many states cap recovery once your share crosses 50% or 51%. Four states and the District of Columbia still follow the older contributory negligence rule, which bars recovery entirely if you are even slightly at fault.
Intentional Torts and Strict Liability
Intentional torts require proof that the wrongdoer acted on purpose. Defamation is a familiar example: publishing a false statement of fact that damages someone’s reputation. Assault, battery, and fraud fall into this group as well.
Strict liability removes intent and carelessness from the picture. A company that sells a defective product is liable for injuries the defect causes regardless of how careful the manufacturing process was. This theory shows up most often in product liability cases and in lawsuits over abnormally dangerous activities.
Deadlines to Sue
Every tort claim has a statute of limitations. Miss it and you lose the right to sue. For personal injury, the deadline runs from one to six years depending on the state, with two years being the most common across roughly 28 states. Medical malpractice and property damage claims sometimes follow different clocks. When a government entity caused the harm, you may face a notice deadline as short as six months.
Contract Law
A contract is a legally enforceable promise. For one to hold up in court you need four pieces: an offer, an acceptance, consideration (something of value exchanged by each side), and legal capacity from parties old enough and mentally competent to agree. The agreement also has to serve a lawful purpose.
Everyday examples include employment agreements that spell out salary, duties, and termination terms; real estate purchase contracts that set the price and conditions for transferring property; and non-disclosure agreements that restrict what an employee or partner can share with outsiders.
The Uniform Commercial Code
When a contract involves selling goods rather than services, the Uniform Commercial Code fills in the gaps. The UCC applies to movable, tangible items and supplies default rules for things the contract doesn’t address. If you and a seller agree on a sale but never specify where delivery happens, the UCC treats the seller’s place of business as the default. If you leave the price open, the UCC plugs in a reasonable market price at the time of delivery. Every state has adopted some version of Article 2.
Remedies for Breach
When one side doesn’t hold up its end, the other can go to court. The most common remedy is compensatory damages: enough money to put you where you would have been if the contract had been performed. Courts may also award reliance damages to cover expenses you incurred while counting on the deal, or restitution to take back profits the breaching party gained unfairly. In rare cases where money can’t adequately fix the problem, a judge can order specific performance, requiring the breaching party to actually do what they promised. This is most common in real estate disputes, where every parcel of land is treated as unique.
Property Law
Property law governs ownership, use, and transfer of real estate and personal belongings. It reaches everything from buying a home to resolving a boundary dispute with a neighbor.
Eminent Domain
The Fifth Amendment limits the government’s power to take private property. Even when the government needs land for a public project like a highway or school, it must pay the owner fair market value. This “just compensation” requirement applies to both federal and state governments and ranks among the oldest property protections in American law.5Legal Information Institute. Takings Clause Overview
Adverse Possession
In a scenario that surprises many people, someone who occupies land they don’t own can eventually gain legal title through adverse possession. The requirements are strict. The possession has to be continuous, open and obvious to anyone looking, hostile to the true owner’s rights (meaning without permission), and exclusive. The required time period varies widely: some states require as few as five years, others as many as twenty. If even one element is missing, the claim fails.
Employment Law
Federal and state laws together regulate the employer-employee relationship from hiring through termination.
Workplace Discrimination
Title VII of the Civil Rights Act makes it illegal for employers to discriminate in hiring, firing, pay, or working conditions based on race, color, religion, sex, or national origin.6Office of the Law Revision Counsel. 42 USC 2000e-2 – Unlawful Employment Practices The law applies to employers with fifteen or more employees. Additional federal statutes extend protection to age, disability, and genetic information, and many states add categories like sexual orientation and marital status.
Wages and Overtime
The Fair Labor Standards Act sets the federal minimum wage at $7.25 per hour, though most states have set higher floors.7U.S. Department of Labor. State Minimum Wage Laws The same law requires overtime at one and a half times your regular rate for any hours worked beyond forty in a single workweek.8Office of the Law Revision Counsel. 29 USC 207 – Maximum Hours Certain salaried and professional employees are exempt from overtime, and that is where many wage disputes originate.
Whistleblower Protections
Federal law prohibits employers from firing workers who report unsafe or illegal practices. The agency you report to depends on the violation: OSHA handles unsafe working conditions, the SEC covers securities fraud, and the IRS handles tax violations. Retaliation such as termination, demotion, or harassment can give rise to a wrongful termination claim.9USAGov. Wrongful Termination
Family Law
Family law handles marriage, divorce, child custody, and support. It is almost entirely a creature of state law, so the specifics vary, but the broad framework is consistent nationwide.
Divorce
Every state now allows no-fault divorce, meaning a spouse can end the marriage by citing irreconcilable differences without proving the other spouse did anything wrong. Some states still require a period of separation first. Residency rules also apply, and most states require you to have lived there for at least six months before filing.
For divorce and separation agreements executed after December 31, 2018, alimony is no longer tax-deductible for the payer and is not counted as taxable income for the recipient. That change reversed decades of prior tax treatment and shifted how support amounts get negotiated.
Child Custody
Courts decide custody based on the best interests of the child, not the preferences of the parents. The exact factors vary by state, but judges commonly weigh the emotional bond between each parent and the child, each parent’s ability to provide a stable home, the child’s ties to school and community, any history of abuse or neglect, and the child’s own preference if old enough to express one. The goal in most states is to maximize both parents’ involvement whenever that is safe and practical.
Intellectual Property Law
Intellectual property law protects creations of the mind, from inventions to brand names to original writing.
Copyright
Copyright protects original works of authorship fixed in a tangible form, including literary works, music, films, software, and architectural designs.10Office of the Law Revision Counsel. 17 USC 102 – Subject Matter of Copyright Protection attaches automatically the moment you create the work. Registration isn’t required, but it strengthens your ability to sue for infringement and collect statutory damages.
The fair use doctrine carves out exceptions for criticism, commentary, news reporting, teaching, and research. Courts evaluate fair use by looking at four factors: the purpose and character of the use (commercial versus educational), the nature of the original work, how much of the work was used, and the effect on the original’s market value.11Office of the Law Revision Counsel. 17 USC 107 – Limitations on Exclusive Rights: Fair Use No single factor is decisive.
Trademarks
A trademark is a word, symbol, or design that identifies the source of goods or services. Infringement happens when someone uses a mark confusingly similar to an existing one on related goods or services, creating a risk that consumers will mistake one brand for the other.12Office of the Law Revision Counsel. 15 USC 1125 – False Designations of Origin and False Descriptions When assessing confusion, courts consider how similar the marks sound, look, and feel, whether the products travel in the same sales channels, and how carefully a typical buyer shops for that type of product.13United States Patent and Trademark Office. Likelihood of Confusion
Trade Secrets
The federal Defend Trade Secrets Act lets businesses sue in federal court when someone steals confidential business information like a customer list, manufacturing process, or proprietary algorithm. Remedies include injunctions, actual damages for losses caused by the theft, and disgorgement of any profits the thief earned. If the theft was willful and malicious, a court can double the damages and award attorney’s fees.14Office of the Law Revision Counsel. 18 USC 1836 – Civil Proceedings
Online Copyright and the DMCA
The Digital Millennium Copyright Act created the notice-and-takedown system that governs most online copyright disputes. A copyright owner who spots infringing material on a website sends a takedown notice to the hosting platform. The platform must remove the material promptly and tell the user who posted it. That user can file a counter-notice if they think the takedown was a mistake, and the platform must restore access within ten to fourteen business days unless the copyright owner files a lawsuit.15U.S. Copyright Office. Section 512 of Title 17 – Resources on Online Service Provider Safe Harbors Platforms that follow the process qualify for safe harbor protection, shielding them from liability for user-uploaded content.
Constitutional Law
Constitutional law sets the boundaries on government power and the fundamental rights the government cannot take away. Every other branch of law operates within the framework the Constitution creates.
The Bill of Rights
The First Amendment prohibits Congress from restricting freedom of speech, religion, the press, peaceful assembly, and the right to petition the government.16Congress.gov. U.S. Constitution – First Amendment The protection has limits: the government can still regulate threats, fraud, and incitement to imminent violence. It cannot punish you simply for expressing an unpopular opinion.
The Fourth Amendment protects against unreasonable searches and seizures, requiring law enforcement to get a warrant based on probable cause before searching your home.17Congress.gov. U.S. Constitution – Fourth Amendment Exceptions apply for emergencies, consent, searches incident to a lawful arrest, and items in plain view.
Due Process
The Fifth Amendment prevents the federal government from depriving anyone of life, liberty, or property without due process of law. The Fourteenth Amendment extends that same protection against state governments, declaring that no state shall “deprive any person of life, liberty, or property, without due process of law.”18Legal Information Institute. 14th Amendment – U.S. Constitution That is the mechanism through which most of the Bill of Rights applies to state and local governments. Without it, a state could theoretically restrict speech or conduct warrantless searches without violating the Constitution.
Administrative Law
Federal agencies write detailed regulations that carry the force of law in specialized areas where Congress lacks the technical expertise to legislate granularly. These agencies can investigate violations, impose fines, and revoke licenses.
Environmental Regulation
The Environmental Protection Agency uses the Clean Air Act to regulate emissions from factories, power plants, and vehicles.19Environmental Protection Agency. Summary of the Clean Air Act Violations are expensive. The inflation-adjusted civil penalty for Clean Air Act violations stands at $124,426 per day per violation, a figure the EPA updates periodically to keep pace with inflation.20eCFR. 40 CFR 19.4 – Statutory Civil Monetary Penalties, as Adjusted for Inflation A single factory with multiple noncompliant emission sources can rack up penalties in the millions within weeks.
Drug and Food Safety
The Food and Drug Administration regulates pharmaceutical labeling under Title 21 of the Code of Federal Regulations. Prescription drug labels have to carry the essential scientific information needed for safe and effective use, including dosage, side effects, and contraindications. Labels that are inaccurate, misleading, or promotional in tone violate federal law and can get a product classified as misbranded.21eCFR. 21 CFR Part 201 – Labeling The FDA can seize misbranded products, issue warning letters, and pursue injunctions to halt distribution.