From Arrest to Trial: How the Criminal Justice System Works

In the United States, more than 10 million arrests happen every year — but fewer than 5% of criminal cases ever reach an actual trial. The other 95% are resolved through plea deals, dismissals, or diversion programs. Understanding why requires understanding the full path a case travels through the system.

- The three main branches of the criminal justice system and what each one does - The sequence of steps a case moves through, from arrest to sentencing - Key vocabulary: arraignment, plea bargain, indictment, due process - Why the vast majority of cases never go to trial

The criminal justice system has three connected branches. Law enforcement (police, sheriffs, federal agents) investigates crimes and makes arrests. The courts (judges, prosecutors, defense attorneys, juries) determine guilt and decide sentences. Corrections (jails, prisons, probation, parole) carries out the sentence. Each branch operates somewhat independently, but a case flows through all three in order.

After an arrest, a suspect is booked and typically brought before a judge within 48-72 hours for an arraignment, where they're formally told the charges and enter a plea (guilty, not guilty, or no contest). If the plea is not guilty, a prosecutor may present evidence to a grand jury for an indictment, or the case proceeds to pretrial hearings. During this stage, over 90% of cases are resolved through a plea bargain — the defendant pleads guilty, often to a lesser charge, in exchange for a reduced sentence, avoiding the time and risk of a full trial for both sides. If no plea deal is reached, the case goes to trial, where a prosecutor must prove guilt "beyond a reasonable doubt" to a judge or jury.

If a defendant is found guilty (or pleads guilty), a judge determines the sentence, which can range from fines and probation to incarceration. The corrections system then carries this out — through jails (short-term, often pretrial or under 1 year), prisons (longer sentences), or community supervision like probation and parole, which allow someone to serve part of a sentence outside custody under specific conditions.