Arrest Conditions under Article 100 of the Code of Criminal Procedure: “Strong Suspicion of Crime”, Risk of Escape/Destruction of Evidence, and Proportionality

1. Introduction

One of the most sensitive areas of criminal procedural law is the measure of arrest, which directly affects personal liberty . Arrest means the temporary restriction of the freedom of a person accused of a crime. However, in practice, this temporary measure often turns into a de facto punishment . Yet, Article 100 of the Code of Criminal Procedure No. 5271 clearly states that arrest is an exceptional measure.

Article 19 of the Constitution and Article 5 of the European Convention on Human Rights (ECHR) protect the right to liberty and security of person. Therefore, arrest warrants issued in cases where the conditions specified in Article 100 of the Code of Criminal Procedure are not met constitute a violation of both the Constitution and international human rights law

This article will examine the three fundamental conditions for arrest— strong suspicion of guilt, risk of escape or destruction of evidence, and the principle of proportionality— in light of legal doctrine, judicial precedents, and case studies.

2. The Legal Nature and Purpose of the Arrest

Arrest is a protective measure and not a punitive one. In the Code of Criminal Procedure system, the purpose of arrest is:

the suspect or defendant from escaping,
the destruction of evidence ,
And that the trial is conducted fairly .

However, this measure must maintain a delicate balance between the necessity of criminal proceedings and personal liberty . The Constitutional Court's " Mustafa Balbay Decision " (Case No: 2012/1272, 04.12.2013) is important in this regard. The decision states that detention cannot become a means of punishment and must in any case be subject to the principle of "proportionality".

3. Strong Suspicion of Crime: The Material Basis for Arrest

3.1 Definition of the Concept

According to Article 100/1 of the Code of Criminal Procedure, an arrest warrant can only be issued if there are " concrete facts demonstrating a strong suspicion of guilt ." Here, "concrete facts" means objective, measurable, and convincing evidence suggesting that the suspect may have committed the crime, even at the very beginning of the trial process

Suspicion alone is not sufficient for arrest. At this point, the level of evidence strong probability . Witness testimony, camera footage, wiretap recordings, forensic reports, or the suspect's own confession can all support strong suspicion.

3.2 Judicial Practice and Problems

In practice, judges often suffice with the statement "there is strong suspicion of guilt." However, according to the Constitutional Court's "Mehmet Haberal Decision" (Case No: 2012/849, 04.12.2013), this statement alone is insufficient. The court explicitly stated that the strong suspicion of guilt be demonstrated with concrete evidence .

3.3 Case Study

In an investigation into "aggravated fraud," if only the complainant's statement is available and there are no documents or camera recordings, this constitutes "simple suspicion," not "strong suspicion of guilt." In this case, judicial supervision should be applied, not arrest.

The 16th Criminal Chamber of the Supreme Court of Appeals has also ruled in similar cases that "arrests based on unilateral statements are unlawful.".

4. Reasons for Arrest: Risk of Escape and Destruction of Evidence

4.1 Suspicion of Escape

The risk of escape is the possibility that the defendant may flee or go into hiding from the trial. This is explicitly stated in Article 100/2-a of the Code of Criminal Procedure. However, the existence of this risk not through abstract assumptions, but through the defendant's behavior.

For example, a defendant's failure to appear for questioning despite being served with summonses, changing their address and going into hiding, attempting to destroy evidence, or using a false identity may all constitute grounds for suspicion of flight.

However, possession of a passport or the fact that the suspect works abroad does not, in itself, constitute grounds for arrest. The Constitutional Court's "Hasan Yıldırım Decision" (Case No: 2012/1234) is clear on this point: Possession of a passport does not constitute presumption of flight risk.

4.2 Risk of Destruction of Evidence

According to Article 100/2-b of the Code of Criminal Procedure, the possibility that the suspect may "destroy or conceal evidence or influence witnesses" is also grounds for arrest. However, this possibility be supported by realistic and concrete facts .

The 9th Criminal Chamber of the Supreme Court of Appeals found the continuation of detention unlawful at a stage where a significant amount of evidence had been collected. This is because "there is no more evidence to be destroyed."

4.3 Case Study

In a murder case, if all witnesses have been heard and the crime scene investigation is complete, the risk of the suspect tampering with evidence has effectively disappeared. Therefore, continuing the detention would be disproportionate and unlawful.

5. Catalog Crimes and the Fallacy of the Presumption of Arrest

Article 100/3 of the Code of Criminal Procedure lists the offenses under which a warrant for arrest may be presumed . However, this provision does not mean that arrest will be automatically applied .

The Constitutional Court has established a clear stance on this issue with the "Ergün Poyraz Decision" (Application No: 2013/850) and the "Mustafa Balbay Decision". Catalog accusations do not negate the obligation to provide concrete justification.

For example, in a charge of "membership in an armed terrorist organization," the mere use of a messaging application does not constitute strong suspicion. Evidence analysis must consider the content of the communication along with the application itself.

At this point the jurisprudence of the Constitutional Court and the European Court of Human Rightsindicates that the catalog of offenses alone is not sufficient grounds for arrest.

6. The Principle of Proportionality and Judicial Control

6.1 Constitutional Basis of the Principle of Proportionality

Articles 13 and 19 of the Constitution stipulate that any limitations on the right to personal liberty must be proportionate . Proportionality is assessed in three stages:

Suitability: The arrest must be appropriate to the aim being achieved.
Reason: Arrest should not be applied if the same purpose can be achieved with a less severe measure.
Proportionality: The duration and justification of detention must be balanced with the severity of the intervention.

6.2 The Alternative Nature of Judicial Control

Article 109 of the Code of Criminal Procedure regulates judicial supervision as an alternative to detention. Before issuing a detention order, the judge must concretely justify why judicial supervision is insufficient.

However, in practice, most decisions simply state that "it has been concluded that judicial supervision would be insufficient." The Constitutional Court, in the "Hidayet Karaca Decision" (Application No: 2015/144), deemed this lack of justification a violation of rights .

6.3 Examples of Disproportionate Arrests

For example, in an economic crime, the sheer amount of damage alone does not justify arrest. the Letellier v. France (1991) decision, the European Court of Human Rights stated that economic magnitude cannot be a reason for arrest.

Similarly, the Ali Şimşek Decision (Case No: 2016/1005), the Constitutional Court deemed the continuation of detention, despite the collection of evidence, disproportionate .

7. Obligation to Provide Justification for Arrest Warrants

According to Article 101/1 of the Code of Criminal Procedure, arrest warrants must be issued with justification. The justification must include the following three elements:

Which evidence creates strong suspicion?
How the risk of escape or destruction of evidence exists,
Why judicial supervision is considered insufficient.

The absence of these elements renders the decision arbitrary. In the Ergün Poyraz ruling , the Constitutional Court deemed merely repeating the relevant legal provision to be lacking in justification

The 5th Criminal Chamber of the Supreme Court of Appeals also deemed the reliance solely on the phrases "evidence and catalog of crimes" as a procedural error

8. Detention Period and Periodic Review

8.1 Maximum Durations

According to Article 102 of the Code of Criminal Procedure;

The maximum detention period for serious crimes is two years, which can be extended by one year in exceptional circumstances.
For minor offenses, the total sentence cannot exceed one year.

These periods upper limits and do not represent "normal" detention periods.

8.2 Periodic Inspection Obligation

According to Article 108 of the Code of Criminal Procedure, detention must be reviewed at least every 30 days . However, in practice, detention is often automatically extended with the statement "previous grounds are valid."

The Constitutional Court, Ahmet Şık ruling (Case No: 2011/2167), determined that this practice violated personal liberty. New developments should be considered in each assessment, and whether the grounds for arrest still exist should be re-evaluated.

9. Unlawful Arrest and State Responsibility

9.1 Scope of Articles 141–144 of the Code of Criminal Procedure

If it is later determined that the arrest was unlawful or wrongful, the individual Articles 141 et seq. of the Code of Criminal Procedure . This compensation covers both material and moral damages.

9.2 Application Example

An arrest warrant was issued for a teacher on charges of "membership in an organization," but eight months later, a decision of no grounds for prosecution was issued. The individual won 40,000 TL in moral damages in a lawsuit filed under Article 141 of the Code of Criminal Procedure . The court stated that the grounds for arrest were abstract and that judicial supervision would have been sufficient.

10. Conclusion and Evaluation

Arrest exceptional protective measure in criminal proceedings. Issuing an arrest warrant without the simultaneous fulfillment of all three elements stipulated in Article 100 of the Code of Criminal Procedure is contrary to both Article 19 of the Constitution and Article 5 of the European Convention on Human Rights.

The biggest problems encountered in practice are:

Assessments based on "strong suspicion" that are not supported by concrete evidence,
The concept of automatic arrest in catalog crimes,
The fact that the alternative of judicial supervision is not being discussed,
These are extension decisions without justification.

To resolve these problems:

Every arrest warrant with concrete evidence .
Judges must clearly demonstrate why judicial supervision is insufficient.
New developments should be taken into account in detention reviews .
The defense must present compelling objections that emphasize the principle of proportionality.

The application of detention measures in a manner respectful of human rights of the rule of law and the right to a fair trial . Criminal procedure is not only the art of punishing the guilty, but also of protecting the freedom of the innocent .

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