Provisional Detention in Switzerland: How It Works and What Are Your Rights?

Being deprived of your liberty before even being tried: provisional detention is the most severe measure in our criminal justice system. Because it directly collides with the presumption of innocence, Swiss law regulates it very strictly. What justifies such a measure? How long can it last? Lavoielegale.ch breaks it down for you.

Provisional detention (often mistakenly referred to as "preventive detention") consists of placing an individual in prison during a criminal investigation. It is an exceptional situation: in Switzerland, freedom remains the rule, and detention the exception.

Here are the 4 key points to understand how it works.

1. When can someone be placed in provisional detention?

For a judge to send you to prison before your trial, mere rumors are not enough. According to the Swiss Code of Criminal Procedure (CPC), two cumulative conditions (which must exist at the same time) are required:

• Serious suspicion: There must be strong and concrete evidence suggesting you committed a crime or serious offense.

• A major risk: Even with strong suspicion, remaining free must pose a severe threat to society or the investigation. The law recognizes three main risks:

  • Flight risk: The person might leave Switzerland to escape trial.

  • Risk of collusion: The person might destroy evidence, collude with accomplices, or exert pressure on witnesses.

  • Risk of reoffending: The person might commit new serious offenses if left free.

2. A race against the clock: the "24h - 48h - 48h" rule

The police and the prosecutor cannot keep you locked up indefinitely without the approval of an independent judge. The procedure is subject to a strict countdown to protect your rights:

1. The police arrest you: they have a maximum of 24 hours to release you or hand you over to the public prosecutor.

2. The prosecutor interrogates you: if they want to keep you in detention, they have 48 hours (from your initial arrest) to submit a formal request to a specialized judge.

3. The Judge (the Compulsory Measures Court / Tribunal des mesures de contrainte) has 48 hours to decide. They can order detention, release you immediately, or impose alternative measures.

3. Is prison mandatory? Alternatives

Swiss justice applies the principle of proportionality. This means that if a less severe measure than prison can resolve the issue (for example, preventing flight), the judge must choose it. These are known as "alternative measures" (mesures de substitution).

Instead of provisional detention, the judge can, for example, require:

• Posting bail (a guaranteed sum of money).

• Surrendering your passport or ID card.

• An obligation to report to the police station weekly.

• Wearing an electronic ankle monitor or house arrest.

4. How long does it last? (And how to get out?)

Provisional detention is never indefinite. The judge sets an initial duration (often 1 to 3 months).

If the investigation is prolonged and the prosecutor wants to keep you longer, they must request an extension from the judge (who can extend detention by 3 months, or exceptionally 6 months). Although strictly monitored, in complex financial or criminal cases, provisional detention can sometimes last for years, which often sparks debate regarding the right to a speedy trial.

Your rights: As an accused person, you are not defenseless. You (or your lawyer) have the right to file a request for release at any time. Furthermore, your conditions of detention must respect human dignity; provisional detention usually takes place in dedicated facilities, separate from where convicted individuals serve their sentences. Even more protective rules apply to minors.

Are you facing criminal proceedings or has someone close to you been arrested? Provisional detention is a complex legal matter where the first hours are crucial. Do not hesitate to contact a lawyer as early as the police interrogation to assert your rights.