Stages of Criminal Proceedings Explained Step by Step
Facing criminal proceedings without understanding how they work is like entering a maze without a map. Fear, uncertainty, and lack of information often lead individuals to make poor decisions at critical moments, with consequences that can be difficult to reverse. However, the Spanish criminal justice system is neither arbitrary nor unpredictable: it follows a clear structure, with well-defined stages and safeguards designed to protect the rights of all parties involved.
Understanding these stages—what happens in each of them and what actions can be taken—is essential both for those under investigation or accused, and for victims seeking to assert their rights. In this article, we explain step by step how criminal proceedings in Spain unfold, from their initiation to the issuance of a final judgment.
Step 1: Initiation of Proceedings — Complaint, Criminal Claim, or Ex Officio Action
All criminal proceedings begin when alleged criminal conduct comes to the attention of the authorities. This can occur through three main channels:
- Complaint: a report made by an individual (victim, witness, or any citizen) to the police, the public prosecutor, or the court.
- Criminal claim (querella): a formal legal action requiring legal representation, allowing the claimant to act as a private prosecutor.
- Ex officio action: when authorities (typically police or prosecution) detect a potential offence directly.
Once the court receives the complaint or police report, the investigating judge assesses whether the facts appear to constitute a criminal offence. If not, the case may be dismissed immediately. If there are sufficient initial indications, preliminary proceedings are opened and the investigation begins.
Step 2: The Investigation Phase — Establishing the Facts
The investigation phase (fase de instrucción) is the core of the criminal process. During this stage, the investigating judge directs all actions aimed at clarifying the facts, identifying potential offenders, and gathering evidence.
Investigative measures may include:
- Statements from suspects and witnesses
- Expert reports
- Searches and seizures
- Interception of communications
- Documentary and financial analysis
- Identification procedures and reconstructions
All measures must respect fundamental rights and be justified by reasoned judicial decisions.
At this stage, the person under investigation acquires the status of suspect. This does not imply guilt; the presumption of innocence remains fully intact.
One of the most critical steps is the suspect’s statement before the judge. The suspect has the right to remain silent, refuse to answer specific questions, and be assisted by a lawyer. Proper preparation is essential, as this statement can significantly affect the outcome of the case.
The investigation concludes when the judge determines that sufficient information has been gathered to decide whether to proceed or dismiss the case.
Step 3: Precautionary Measures — Ensuring the Process
During the investigation, the judge may impose precautionary measures to ensure the proper conduct of proceedings and prevent risks such as flight, destruction of evidence, or interference with the investigation.
The most severe measure is pre-trial detention, which may only be ordered under strict legal conditions and must be proportionate.
Other measures include:
- Periodic court appearances
- Passport confiscation
- Travel restrictions
- Financial bail
- Restraining orders
The judge must always apply the least restrictive measure necessary.
Step 4: The Intermediate Phase — Trial or Dismissal?
Once the investigation is complete, the process enters the intermediate phase, which acts as a filter between investigation and trial.
- The prosecution decides whether to file formal charges or request dismissal.
- The defence submits its response, challenging the allegations or presenting alternative arguments.
If no accusation is maintained, the case is dismissed. This may be:
- Final dismissal: permanently closing the case
- Provisional dismissal: allowing reopening if new evidence emerges
If at least one party files charges and the judge finds sufficient indications, an order is issued to open trial proceedings.
Step 5: The Trial — The Decisive Stage
The trial is the central phase of criminal proceedings. It is conducted under the principles of orality, publicity, immediacy, and adversarial process.
The trial includes:
- Reading of the charges and defence submissions
- Examination of evidence (defendant, witnesses, experts, documents)
- Closing arguments by both parties
The accused has full defence rights, including the right to remain silent and to challenge evidence. The burden of proof lies entirely with the prosecution, which must prove guilt beyond reasonable doubt.
Jurisdiction depends on the seriousness of the offence:
- Criminal Courts: less serious offences
- Provincial Courts: more serious offences
- National Court: specific complex or high-profile crimes
Step 6: The Judgment — Conviction or Acquittal
After the trial, the court delivers its judgment:
- Acquittal: the offence is not proven; no criminal record arises.
- Conviction: the offence is proven; penalties are imposed.
Penalties may include imprisonment, fines, community service, disqualification, and civil liability (compensation to victims).
Judgments at first instance may be appealed.
Step 7: Appeals — When the Judgment Can Change
The Spanish system provides mechanisms to challenge judicial decisions:
- Appeal before higher courts (e.g., Provincial Court or High Court of Justice)
- Cassation appeal before the Supreme Court in specific cases
A judgment becomes final when no further appeals are possible. Only then do its full legal effects arise, including criminal record registration and enforcement of the sentence.
Step 8: Enforcement — Serving the Sentence
Once the conviction is final, the enforcement phase begins.
However, imprisonment is not always immediate. The law allows for:
- Suspension of prison sentences (in certain conditions)
- Substitution with alternative penalties
- Expulsion (for certain non-resident foreign nationals)
During enforcement, additional legal mechanisms may apply, such as parole, prison classification, or sentence benefits.
Legal Defence: Essential at Every Stage
An effective defence cannot be limited to a single stage of proceedings. Each phase has its own opportunities and risks, and actions taken early will influence later outcomes.
A specialised criminal lawyer:
- Advises from the outset
- Ensures procedural guarantees
- Challenges unlawful evidence
- Prepares defence strategy
- Represents the client at trial
- Handles appeals
Delaying legal advice is one of the most common and serious mistakes. Early intervention significantly improves the chances of a favourable outcome.
Frequently Asked Questions
How long do criminal proceedings take?
The duration varies greatly. Simple cases may conclude within months, while complex cases may take years or even over a decade due to investigation, trial scheduling, and appeals.
Can I reach an agreement with the prosecution?
Yes. The system allows for plea agreements (conformidad), where the accused accepts the charges in exchange for a reduced sentence. This decision should always be made with legal advice.
What is the difference between Criminal Courts and Provincial Courts?
Criminal Courts handle less serious offences, while Provincial Courts deal with more serious crimes. In both cases, the trial judge is different from the investigating judge.
Will I have a criminal record if I am acquitted?
No. Only final convictions generate criminal records.
Can a dismissed case be reopened?
It depends. A provisional dismissal allows reopening if new evidence emerges, whereas a final dismissal permanently closes the case.
