Degrees of suspicion: reasonably suspected and probable cause

This guide is informational. Always verify how the rules apply to your specific case.

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Short answer: Reasonably suspected is a lower degree of suspicion than suspected on probable grounds. Reasonable suspicion should be based on concrete circumstances that with some strength indicate that the person has committed the crime. Probable grounds imply a stronger suspicion and are normally required for arrest and detention. Neither level means that the person is guilty.

Sufficient grounds for prosecution is the prosecutor's threshold for bringing charges, not just a new name for probable grounds. Beyond reasonable doubt is the significantly higher standard of proof that the court uses for a conviction. The degrees of suspicion are not mathematical percentages and can change as the investigation develops.

This article provides general information. How strong a particular suspicion is can only be assessed against the actual material in the case. See also comprehensive guide for suspects, rights during police questioning and arrested, detained, and remanded.

Degrees of suspicion: from reasonably suspected to prosecution

Concept	What it means	Typical legal meaning	What it does not mean
Reason to believe that a crime has been committed	The threshold for initiating a preliminary investigation primarily applies if there is reason to believe that a crime under public prosecution has been committed.	A criminal investigation can be initiated without any specific person being suspected.	That a certain person is reasonably suspected.
Can be suspected	An expression of a very early and weak suspicion directed at a person.	Can justify continued monitoring and investigation, but does not in itself activate all the rights that follow from reasonable suspicion.	A legal percentage or proof of guilt.
Reasonably suspected	Concrete circumstances speak with some strength for the person having committed the crime.	Notification of suspicion, rights information, and ongoing insight according to Chapter 23, Section 18 of the Code of Judicial Procedure.	That the evidence is sufficient for prosecution or conviction.

The next three concepts are later in the chain: stronger suspicion, prosecution, and conviction.

Concept	What it means	Typical legal meaning	What it does not mean
Suspected on probable grounds	A higher degree of suspicion than reasonable suspicion.	Is normally the degree required for arrest and detention, along with other legal requirements.	That detention is automatic or that guilt is established.
Sufficient grounds for prosecution	The prosecutor assesses that the investigation provides a legal basis to bring charges.	Charges are submitted to the court, which conducts an independent review.	That the court must convict the person.
Beyond reasonable doubt	The standard of proof for a conviction in criminal cases.	The court must acquit if a reasonable doubt about guilt remains.	A degree of suspicion during the preliminary investigation.

The choice of words can vary between decisions, interrogations, and official information. The central issue is not the label alone but the specific circumstances that support the assessment and the decision to be made.

"Can be suspected": an early suspicion, but not reasonable suspicion

The expression can be suspected is used for a low level of suspicion when a person has come into the focus of the investigation but the basis does not yet reach reasonable suspicion. It should not be confused with the threshold in Chapter 23, Section 1 of the Code of Judicial Procedure: reason to believe that a crime has been committed. The latter applies to whether a preliminary investigation should be initiated and can be fulfilled without any specific perpetrator being identified.

A person questioned at an early stage should still ask in what role the interrogation is being conducted. If questions begin to focus on their own possible involvement, the role may change during the investigation. When the level reaches reasonable suspicion, the suspicion must be communicated during interrogation and rights information provided.

Certain investigative measures can be used before a person is reasonably suspected, while other coercive measures require an explicit degree of suspicion and additional conditions. Therefore, the applicable threshold must be checked against the provision that the authority bases that specific measure on.

Reasonably suspected: what does the degree of suspicion mean?

Reasonable suspicion requires more than a vague possibility, association, or general suspicion. The Swedish Prosecution Authority describes the level as the lower degree of suspicion in relation to probable grounds. In legal practice and official guidance, the core is often expressed as specific circumstances with some strength indicating the person's involvement.

Examples of circumstances that may be included in the assessment

observations linking the person to the place or event,
technical evidence, traces, or digital information,
information from the injured party or witnesses,
possession of objects that can be linked to the act,
the person's own statements in relation to other investigations, and
several circumstances that are weak individually but together gain greater significance.

The list is not an evidence catalog. Reliability, alternative explanations, timing, and how the information has emerged must be assessed. An anonymous or unverified piece of information may need support from other material. The same circumstance can carry different weight depending on the type of crime and context.

What happens when the level is reached?

When the preliminary investigation has progressed to the point where someone is reasonably suspected, the person must be informed of the suspicion according to Chapter 23, Section 18 of the Code of Judicial Procedure when the person is questioned. After being informed, the suspect and the defense attorney have an ongoing right to access what has transpired, to the extent that it can be done without harming the investigation.

At the same time, the person must be informed according to Section 12 of the Preliminary Investigation Ordinance about, among other things:

the right to engage a defense attorney and the possibility of a public defender,
the right to receive information about changes in the suspicion,
the right to insight according to the Code of Judicial Procedure,
the right to an interpreter and translation if needed, and
the right not to speak or otherwise contribute to the investigation of one's own guilt.

Reasonable suspicion can also be a threshold for certain coercive measures. But it is not sufficient on its own: each measure has its own requirements regarding the severity of the crime, purpose, necessity, and proportionality.

Probable cause: what does the higher degree of suspicion mean?

Probable cause is the higher of the two central degrees of suspicion explicitly used in detentions under Chapter 24 of the Code of Judicial Procedure. The basis must be stronger than for reasonable suspicion. This level is also not a court's final determination of guilt.

For detention according to the main rule, it is required that the person is suspected on probable cause of a crime for which imprisonment of one year or more is prescribed. Additionally, there is normally a risk of one of the following:

Risk of flight: risk that the person will abscond or evade prosecution or punishment.
Risk of collusion: risk that the person will destroy evidence or otherwise obstruct the investigation.
Risk of recidivism: risk that the person will continue their criminal activity.

The court must also make a proportionality assessment. Detention may only occur if the reasons outweigh the intrusion or harm to the suspect or other opposing interests. If it can be assumed that the penalty will only be a fine, detention may not occur.

The exception: investigative detention on reasonable suspicion

In exceptional cases, a person may be detained already at the level of reasonable suspicion. Then the conditions for detention must otherwise be met, and it must be of particular importance that the person is taken into custody pending further investigation. A new hearing must be held within a week. If probable cause is not reached by then, or other grounds for detention are lacking, the detention must be lifted.

See the separate guide on detentions and time limits for the entire decision-making process.

Sufficient grounds for prosecution: the prosecutor's decision threshold

The task of the preliminary investigation, according to Chapter 23, Section 2 of the Code of Judicial Procedure, is to investigate who can reasonably be suspected and whether there are sufficient grounds for prosecution. When the preliminary investigation is concluded, a decision must be made on whether to bring charges.

The prosecutor is subject to the principle of objectivity and must consider both what speaks against the suspect and what is in the person's favor. The Swedish Prosecution Authority describes the duty to prosecute as requiring prosecution when the prosecutor objectively assesses that the evidence is sufficient for a conviction, with exceptions as provided by rules on, for example, waiver of prosecution and special prosecutorial review.

Before the decision to prosecute, the suspect and the defense attorney should normally receive final notification according to Chapter 23, Section 18 a of the Code of Judicial Procedure. They should have access to the material, reasonable time to request additions, and the opportunity to provide comments. Prosecution cannot be decided before this has occurred.

Why probable cause and sufficient cause are not the same thing

A detention review often occurs early and concerns whether the deprivation of liberty may continue.
A decision to prosecute should be based on the completed investigation and concerns whether the matter should be tried in court.
The court's detention assessment does not bind the court at the main hearing.
A person may have been detained on probable cause but later released or not prosecuted if the evidentiary situation weakens.

Beyond a reasonable doubt: the evidentiary requirement for a conviction

When prosecution is initiated, the prosecutor is a party and bears the burden of proof for the alleged act. The accused should be considered innocent until guilt has been established through legal proceedings. For a conviction, the charge must be proven beyond a reasonable doubt.

This does not mean that every theoretical possibility must be excluded. However, a reasonable alternative explanation supported by the investigation may mean that the evidentiary requirement is not met. The court assesses the evidence collectively and independently after the main hearing.

A detention judge may have previously assessed that probable cause existed without this determining the question of guilt. A detention hearing has a different purpose, different basis, and a lower threshold than the main hearing.

The degree of suspicion can be raised, lowered, or dismissed

The degree of suspicion is an assessment at a certain point in time. It can change when new interviews, analyses, films, phone records, or alternative explanations are added. Even the classification of the crime can change independently of the degree of suspicion.

Change	Example of cause	Possible consequence
The suspicion is strengthened	Technical evidence confirms a central detail.	The level can be raised to probable cause and detention can be reconsidered if other requirements are met.
The suspicion is weakened	An alibi or other verifiable explanation is supported.	Coercive measures should be reconsidered and may need to be lifted.
The classification changes	New circumstances change the legal assessment of the act.	The suspect should be informed of the change.
The suspicion is dismissed	The investigation shows that the person cannot be the perpetrator or that the evidence does not hold.	The preliminary investigation against the person can be closed and detention should cease.

Therefore, inquire about both the current degree and the specific act to which the degree pertains. A person can simultaneously be suspected of several acts at different levels.

Checklist: verify a notice regarding suspicion level

What exact act is the assessment concerning?
What criminal classification is currently being used?
Is the level "may be suspected," reasonably suspected, or suspected on probable grounds?
When was the assessment made or communicated?
Have I been informed of the suspicion according to Chapter 23, Section 18 of the Code of Judicial Procedure?
Have I received rights information according to Section 12 of the Preliminary Investigation Ordinance?
Has the suspicion or classification changed since the last interview?
Which decision is based on the suspicion level: interview, coercive measures, arrest, or detention?
What additional requirements must be met for that specific decision?
Have I and the defense counsel received the insight that the law permits at this stage?

Suspicion levels when a child or student is suspected

The same terms are used when the suspect is under 18 years, but the frameworks are different. Since July 1, 2025, the principal must report to the police according to Chapter 6a, Section 10 of the Education Act when it may be suspected that a student has committed a crime in connection with school activities, unless overriding reasons argue against it. It is the lowest level in the table above. A police report from the school thus only indicates that there is some concrete circumstance, not that the student is reasonably suspected. What the school is obliged to do and what guardians can request is described in concern report from the school: reporting obligation and police report.

Under 15 years: the child is not criminally responsible. The police can still investigate according to Section 31 of the Act with Special Provisions on Young Offenders (LUL). Guardians must be summoned to the interview. Social services always receive a concern report.
14 years and serious crimes: since September 10, 2026, the age of criminal responsibility has been lowered to 14 years for serious crimes during a five-year period. For these crimes, the usual suspicion levels of the preliminary investigation also apply to 14-year-olds.
15 to 17 years: regular preliminary investigation, but with the right to a public defender, shorter time limits, and social services present during interviews. Detention of children requires exceptional reasons.
Serious conversation from January 2, 2027: when the police inform social services that a child is suspected for the first time of a crime that can lead to imprisonment, social services must hold a serious conversation within 14 days (Chapter 19a of the Social Services Act). It is a social intervention, not part of the evidence assessment.

For parents, the practical lesson is the same as for adult suspects: ask what suspicion level applies, what act it concerns, and what decision is based on it. Also read children under 15 and police coercive measures.

Frequently Asked Questions

What are degrees of suspicion?

Degrees of suspicion describe how strong the suspicion against a person is at a certain point in the criminal investigation: can be suspected, reasonably suspected, and on probable cause suspected. They are not the same as the classification of the crime, the threshold for prosecution, or the standard of proof for a conviction.

What percentage is reasonable suspicion?

Swedish law does not specify a percentage. The assessment is legal and qualitative: there must be concrete circumstances that with some strength indicate that the person has committed the act. Percentages risk obscuring questions about the quality of the evidence and alternative explanations.

Is probable cause the same as more than 50 percent probability?

No, the law does not define the level as a mathematical threshold. Probable cause is a higher degree of suspicion than reasonable suspicion, but it is assessed based on the concrete content of the investigation.

Is one automatically detained on probable cause?

No. The main rule also requires the appropriate penalty scale, a reason for detention, and proportionality. There are special rules and exceptions, including for very serious crimes, identity issues, or lack of residence in Sweden.

Can I be reasonably suspected without having been informed?

An investigation can proceed before notification is given. But when the preliminary investigation reaches reasonable suspicion, you should be informed of the suspicion when you are questioned. If you are asked about your own involvement, you should ask what role and degree of suspicion apply.

Can the prosecutor bring charges without me having been detained?

Yes. Most prosecution decisions do not require that the person has been deprived of liberty. Detention is a coercive measure with its own requirements, while prosecution is determined by whether there are sufficient grounds and whether charges should be brought according to applicable rules.

Can the court acquit someone who has been detained on probable cause?

Yes. Detention is a preliminary assessment during the process. At the main hearing, the court will examine the entire indictment and may only convict if guilt is proven beyond a reasonable doubt.

Can I find out the circumstances behind the suspicion?

When you are notified, you should be informed of the act to which the suspicion pertains. After the notification, there is a continuous right to access information, but it can be restricted during an ongoing investigation if disclosure would harm the investigation. A person who is detained or arrested also has the right to be informed of the circumstances that form the basis for the deprivation of liberty.

Sources and further reading

Last fact-checked against current legislative text and official authority sources: October 5, 2026. The article provides general information and does not replace a defense attorney's assessment of the evidence in an individual case.

Degrees of suspicion: reasonably suspected and probable cause

As a suspect: from the first interview to the prosecution decision

Suspected of a Crime – Your Rights from Police Interrogation to Detention

Police Interrogation as a Suspect – Rights Before, During, and After the Interrogation