What Makes a Case Criminal?
A case is criminal when the government prosecutes conduct that a statute defines as a crime and seeks punishment — fines, probation, or imprisonment — rather than compensation. Two elements run through nearly all crimes: a prohibited act (actus reus) and a culpable mental state (mens rea), such as intent, knowledge, or recklessness. Because liberty is at stake, the prosecution must prove every element beyond a reasonable doubt — a constitutional requirement the Supreme Court confirmed in In re Winship, 397 U.S. 358 (1970). Crimes are graded as felonies (punishable by more than a year in prison) or misdemeanors, and the label controls everything from which court hears the case to what rights attach.
Who Brings the Case in Criminal Law?
The government, always. State charges are brought by a district attorney, state’s attorney, or county prosecutor; federal charges by a U.S. Attorney. That is why criminal cases are captioned State v. Smith or United States v. Smith. The victim of a crime is a witness, not a party: the prosecutor decides whether to file charges, what to charge, whether to offer a plea, and whether to dismiss — even over the victim’s objection. A victim who wants compensation must file a separate civil suit, which is where civil case law examples take over.
How a Criminal Case Moves Through the System
A typical case passes through a recognizable sequence:
- Investigation and arrest, governed by the Fourth Amendment case law on stops and searches.
- Charging — by a prosecutor’s complaint or information, or a grand jury indictment for serious federal charges.
- Arraignment, where the defendant hears the charges, enters a plea, and bail or release conditions are set.
- Discovery and pretrial motions — including motions to suppress evidence and the prosecution’s constitutional duty under Brady v. Maryland, 373 U.S. 83 (1963), to disclose favorable evidence to the defense.
- Plea or trial. The overwhelming majority of criminal cases end in plea agreements rather than trials.
- Sentencing and appeal. Appellate review of convictions is where most published criminal case law is made.
Criminal Case Law Examples
The best-known criminal cases are about procedure — the rules police and courts must follow. Miranda v. Arizona, 384 U.S. 436 (1966), requires warnings before custodial interrogation. Gideon v. Wainwright, 372 U.S. 335 (1963), guarantees appointed counsel to felony defendants who cannot afford a lawyer. Mapp v. Ohio, 367 U.S. 643 (1961), excludes unconstitutionally seized evidence from state trials. And Brady, above, polices the fairness of the contest itself. Substantive criminal case law matters too — courts constantly decide what statutory terms like “possession” or “serious bodily injury” mean — but the procedural landmarks are the ones that shape every case, which is why we cover the policing side separately in police case law.
DUI Case Law
Drunk-driving cases generate a disproportionate share of criminal case law because they sit at the intersection of the Fourth Amendment and chemistry. Schmerber v. California, 384 U.S. 757 (1966), allowed a warrantless blood draw on the specific facts of that case; decades later, Missouri v. McNeely, 569 U.S. 141 (2013), clarified that the natural dissipation of alcohol does not automatically excuse getting a warrant. Birchfield v. North Dakota, 579 U.S. 438 (2016), then split the difference for implied-consent laws: warrantless breath tests are permissible incident to a lawful DUI arrest, but warrantless blood tests generally are not, and a state cannot make refusing a blood test itself a crime. Sobriety checkpoints, meanwhile, survived Fourth Amendment challenge in Michigan Department of State Police v. Sitz, 496 U.S. 444 (1990), though some states ban them under their own constitutions or statutes.
Criminal vs Civil: The Same Facts, Two Cases
One event can produce two entirely separate cases, because the criminal and civil systems answer different questions under different standards. The classic illustration is O.J. Simpson: acquitted of murder in the 1995 criminal trial, then found liable for the deaths in a 1997 civil wrongful-death suit and ordered to pay damages. There is no contradiction — the criminal jury was not convinced beyond a reasonable doubt, while the civil jury found liability more likely than not on a lower standard with different evidence rules. Double jeopardy does not bar the second case, since a civil suit is not a second prosecution. The pattern repeats daily at smaller scale: assaults, crashes, and frauds routinely generate a prosecution and a lawsuit side by side.