A state crime is an offense defined by a state legislature and prosecuted in that state’s courts; a federal crime is an offense defined by Congress and prosecuted in federal court. That one-line distinction between state crimes vs federal crimes controls which police agency investigates, which prosecutor files charges, which judge hears the case, and — the part most defendants care about — how much time you actually serve. State courts handle the overwhelming majority of criminal prosecutions in the United States. Federal criminal law is narrower, reserved for conduct that reaches across state lines or touches a specific federal interest.
What Counts as a State Crime
Almost everything you’d think of as “a crime” is a state crime. Assault, murder, sexual assault, and robbery are prosecuted under state law. So are theft, burglary, and arson. DUI, drug possession, domestic violence, and traffic offenses all fall under state jurisdiction. Each state writes its own criminal code, so the exact definition of an offense and the penalty attached to it can differ sharply across state lines. What’s a misdemeanor in one state can be a felony in the next, often turning on dollar thresholds or aggravating circumstances.
State crimes are investigated by local and state law enforcement. Municipal police departments cover cities and towns, county sheriffs cover unincorporated areas, and state police run statewide investigations and patrol the highways. County or district prosecutors — often called district attorneys or state’s attorneys — bring the cases in state courts that operate independently of the federal system.
What Makes a Crime Federal
Federal jurisdiction generally kicks in when one of these triggers is present:
- Interstate activity. The conduct crosses state lines or uses interstate communications, mail, or transportation. This is the hook for federal wire fraud, mail fraud, and many drug trafficking charges.
- Federal property. The crime occurs on a military base, in a national park, inside a federal building, or on an Indian reservation.1Department of Justice. Protection of Government Property – Military Bases
- Federal interests. The crime targets the federal government, its agencies, officers, or funds. Tax fraud, counterfeiting, and lying to a federal agent fit here.
- Immigration and customs. Congress has exclusive authority over immigration, so immigration offenses are always federal.
Federal investigations are run by agencies with specialized mandates. The FBI handles everything from terrorism to public corruption. The DEA targets drug trafficking. The ATF covers firearms and explosives. The Secret Service investigates counterfeiting and certain financial crimes. IRS Criminal Investigation pursues tax fraud. The cases are then prosecuted by Assistant United States Attorneys in the 94 federal district courts spread across the country.
When Both Governments Can Prosecute the Same Act
Some conduct sits squarely within both state and federal authority. Starting in the 1930s, Congress passed statutes making bank robbery, kidnapping, certain firearm offenses, theft, and extortion federal crimes when they involve crossing state lines or using interstate commerce.2Federal Judicial Center. Jurisdiction: Criminal Drug trafficking is the most common overlap. Every state criminalizes drug distribution, and federal law does too. In these situations, state and federal prosecutors independently decide whether to bring charges based on the seriousness of the conduct, available evidence, and whether a meaningful federal interest is at stake.
Here’s the part that catches most people off guard. Being prosecuted in state court for an act doesn’t stop the federal government from prosecuting you for the same conduct, and the reverse is also true. The Supreme Court reaffirmed this in Gamble v. United States (2019), holding that state and federal governments are separate sovereigns with their own distinct laws. Because each sovereign defines its own offenses, a single act can constitute two different crimes under two different legal systems, and prosecuting both doesn’t violate the Double Jeopardy Clause.3Justia Supreme Court Center. Gamble v. United States, 587 US (2019)
In practice, dual prosecutions are rare. The Department of Justice maintains an internal guideline called the Petite policy that generally discourages federal prosecution when a state has already handled the case, unless the prior prosecution left a substantial federal interest unaddressed. But the authority to prosecute again is there, and it gets used in high-profile cases, particularly civil rights cases where a state acquittal is followed by a separate federal charge.
How Each System Classifies Offenses
Both systems divide crimes by severity, but the schemes aren’t identical.
State Classifications
Most states split offenses into felonies and misdemeanors. A felony is generally any crime punishable by more than one year of imprisonment, typically served in a state prison. A misdemeanor carries a maximum of up to one year, usually served in a county jail. Many states further subdivide these into classes or degrees (Class A, Class B, and so on) to separate more and less serious offenses within each category.
Below misdemeanors, many states recognize infractions. Minor violations like speeding tickets or jaywalking carry fines but no jail time and generally don’t create a criminal record in the traditional sense, though they may appear on a driving record. The gap between an infraction and a misdemeanor matters more than people realize: a misdemeanor conviction is a criminal record that can show up on background checks, while an infraction typically is not.
Federal Classifications
Federal law uses a lettered grading system that maps each offense class to a maximum imprisonment term:4Office of the Law Revision Counsel. 18 US Code 3559 – Sentencing Classification of Offenses
- Class A felony: life imprisonment or death
- Class B felony: 25 years or more
- Class C felony: 10 to less than 25 years
- Class D felony: 5 to less than 10 years
- Class E felony: more than 1 year but less than 5 years
- Class A misdemeanor: more than 6 months, up to 1 year
- Class B misdemeanor: more than 30 days, up to 6 months
- Class C misdemeanor: more than 5 days, up to 30 days
- Infraction: 5 days or less, or fine only
When a federal statute doesn’t specify a classification, the court assigns one based on the maximum sentence authorized. The felony-misdemeanor dividing line is the same in both systems — one year of imprisonment — but the internal grading and the sentencing consequences that flow from each grade differ considerably.
Why Federal Sentences Hit Harder
Sentencing is the starkest practical difference between the two systems, and it’s the one defendants care about most.
Federal courts operate under the United States Sentencing Guidelines, a detailed framework that calculates a recommended sentencing range based on the offense severity and the defendant’s criminal history. Judges aren’t strictly bound by the guidelines after the Supreme Court’s 2005 Booker decision, but they must consider them, and most sentences land within or near the calculated range.
The most important practical difference is this one. Federal parole was abolished by the Sentencing Reform Act of 1984 for offenses committed after November 1, 1987.5Department of Justice. United States Parole Commission Federal inmates can earn limited good-time credit, but they’ll serve at least 85% of their sentence. A 10-year federal sentence means roughly eight and a half years behind bars, minimum.
State sentencing varies enormously. Some states have their own sentencing guidelines; others give judges broad discretion. Most states still have some form of parole, so a prisoner can be released under supervision well before the full sentence expires. A 10-year state sentence might result in release after three or four years in some jurisdictions. The gap between a state sentence and a federal sentence of the same nominal length can be measured in years of actual time served.
The federal system is also selective about which cases it takes, and the numbers show it. In fiscal year 2022, about 90% of federal defendants pleaded guilty, and fewer than 1% of those who went to trial were acquitted.6Pew Research Center. Fewer Than 1% of Federal Criminal Defendants Were Acquitted in 2022 Federal prosecutors generally don’t file charges until the investigation is thorough, which means by the time you’re indicted in federal court, the government is confident it can convict.
How Long Prosecutors Have to File Charges
Both systems impose time limits on charging, but the specific windows differ.
At the state level, murder has no statute of limitations in virtually every state. Many states also exempt other serious violent offenses and sex crimes involving minors from any time limit. For other felonies, the limitation period commonly runs three to six years. For misdemeanors, it’s often one to three years. These timeframes vary significantly by state, and the clock can sometimes be paused, or “tolled,” when the suspect is out of state or the crime goes undiscovered.
The federal default is five years for most offenses. Capital crimes and certain terrorism-related offenses have no federal time limit. Specific statutes carve out longer windows for particular crimes — certain tax offenses get six years, and major fraud offenses can have ten.
Consequences That Follow You After the Sentence
The formal sentence is only part of the picture. Both state and federal convictions carry collateral consequences that can follow you for decades, and some of the most impactful restrictions cross the state-federal boundary.
Firearm Restrictions
Federal law prohibits anyone convicted of a crime punishable by more than one year of imprisonment from possessing, receiving, or transporting firearms. This applies to state felony convictions, not just federal ones. The phrase “convicted in any court” is intentional. A separate prohibition covers anyone convicted of a misdemeanor crime of domestic violence in any court.7Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Violating either prohibition is itself a federal felony, which means a person with a state conviction who picks up a firearm faces federal prosecution even though the underlying offense was a state matter.
Voting Rights
Felony disenfranchisement is handled entirely at the state level, and the approaches range widely. A couple of states impose no restrictions at all, allowing voting even from prison. Many states automatically restore voting rights once a person is released from incarceration. Others require completion of the full sentence, including parole and probation, and sometimes payment of all fines and restitution. A few states require a governor’s pardon or an individual petition to the courts. The variation is dramatic enough that the same felony conviction might cost you voting rights for a few years in one state and permanently in another without affirmative action to restore them.
Professional Licensing
A felony conviction, state or federal, can block access to licensed professions. Many state licensing boards impose automatic disqualifications for certain conviction types, particularly violent or serious offenses. Beyond those bright-line bars, “good moral character” requirements built into licensing standards have historically been interpreted broadly enough to deny applicants with any criminal record. The practical effect is that even after serving a sentence, a person may be shut out of careers in healthcare, education, finance, law, and dozens of other licensed fields. Some states have enacted reforms limiting how far back licensing boards can look or requiring a direct relationship between the conviction and the occupation, but the terrain remains restrictive in much of the country.