Degrees of suspicion: reasonably suspected, probable grounds and prosecution

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

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Brief 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 implies a stronger suspicion and is 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 a 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.

Overview: the stages from investigation to verdict

Term	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 subject to 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 for a very early and weak suspicion directed at a person.	May 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 access according to Chapter 23, Section 18 of the Code of Judicial Procedure.	That the evidence is sufficient for prosecution or conviction.

The next three terms 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 may vary between decisions, interrogations, and official information. The central issue is not the label alone but the specific circumstances that support the assessment and what decision is 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 if a preliminary investigation is to 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 interview is being conducted. If questions begin to focus on one's own possible involvement, the role may change during the investigation. When the level reaches reasonable suspicion, the suspicion must be notified during the interview and the 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 particular measure on.

What does reasonably suspected 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 concrete circumstances with a certain strength indicating the person's involvement.

Examples of circumstances that may be included in the assessment

observations linking the person to the location or event,
technical evidence, traces, or digital information,
information from the complainant or witnesses,
possession of items that can be connected to the act,
the person's own statements in relation to other investigations, and
several circumstances that individually are weak 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 detriment to the investigation.

At the same time, according to Section 12 of the Preliminary Investigation Ordinance, the person must be informed 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 access 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 the 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.

What does it mean to be suspected on probable grounds?

Probable grounds is the higher of the two central levels of suspicion explicitly used in deprivation of liberty 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 grounds of a crime for which imprisonment of one year or more is prescribed. In addition, there is normally a risk of any 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 activities.

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

Exception: investigative detention on reasonable suspicion

In exceptional cases, a person may be detained already at the level of reasonable suspicion. In such cases, 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 grounds has not been reached by then, or if 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

According to Chapter 23, Section 2 of the Code of Judicial Procedure, the purpose of the preliminary investigation 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 initiate prosecution.

The prosecutor is subject to the principle of objectivity and must consider both what speaks against the suspect and what speaks in the person's favor. The Swedish Prosecution Authority describes the duty to prosecute as requiring prosecution to be initiated 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 prosecution 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 be given 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 grounds 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 grounds but later released or not prosecuted if the evidentiary situation weakens.

Beyond a reasonable doubt – the standard of proof 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 regarded as innocent until guilt has been established through legal proceedings. For a conviction, it is required that the charge is 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 burden of proof is not met. The court assesses the evidence collectively and independently after the main hearing.

A detention judge may have previously assessed that probable grounds 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 data, or alternative explanations are added. The classification of the crime can also change independently of the degree of suspicion.

Change	Example of cause	Possible consequence
Suspicion is strengthened	Technical evidence confirms a central fact.	The level can be raised to probable grounds, and detention can be considered if other requirements are met.
Suspicion is weakened	An alibi or other verifiable explanation is supported.	Coercive measures should be reconsidered and may need to be revoked.
Classification is changed	New circumstances alter the legal assessment of the act.	The suspect must be informed of the change.
Suspicion is dismissed	The investigation shows that the person cannot be the perpetrator or that the evidence is insufficient.	The preliminary investigation against the person can be closed, and detention must cease.

Therefore, inquire about both the current degree and the specific act to which the degree pertains. A person can simultaneously be suspected of multiple 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 "can 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 been granted the insight that the law permits at this stage?

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Frequently Asked Questions

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What are suspicion levels?

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Suspicion levels describe how strong the suspicion against a person is at a certain point in the criminal investigation: can be suspected, reasonably suspected, and suspected on probable grounds. They are not the same as criminal classification, indictment threshold, or the evidentiary requirement for a conviction.