Grounds for detention.

The basic preconditions of pre-trial detention

In Austria, pre-trial detention (Untersuchungshaft) may be ordered only where two requirements are met simultaneously: a strong suspicion (dringender Tatverdacht) of an offence punishable by a criminal court, and at least one ground for detention under Section 173(2) StPO (Strafprozessordnung / Code of Criminal Procedure). If either is missing, the detention is unlawful. The strong suspicion requires a significantly higher probability than mere initial suspicion: on the state of the file, it must be more likely than not that the accused committed the offence. The bare possibility is not enough, the court must weigh incriminating against exculpatory circumstances and set its assessment out in the reasoning for detention.

On top of this comes the requirement of proportionality under Section 5 StPO. Pre-trial detention is ultima ratio: it is permitted only where the purpose cannot equally be achieved by a less intrusive measure (gelinderes Mittel), a directive, bail (Kaution) or an electronic ankle tag. Its duration must also not be out of proportion to the sentence to be expected. Proportionality has to be examined afresh at every detention decision, at first order, at every detention review hearing and at every decision on continuation. The longer detention lasts, the stricter the test.

Section 173(2) StPO, the four grounds for detention

The statute lists the grounds exhaustively in three subparagraphs: (1) risk of flight (Fluchtgefahr), (2) risk of collusion (Verdunkelungsgefahr) and (3) the risk of repeated offending and risk of execution (Tatbegehungs- und Ausführungsgefahr). The risk of repeated offending and the risk of execution are systematically grouped together under subparagraph (3); lit a to c cover risk of repeated offending, lit d covers risk of execution. In practical terms, four self-contained grounds are distinguished. A single ground, established concretely, suffices, conversely, the fall-away of one ground that has until now carried the detention may justify release, provided the remaining grounds do not stand on their own. Every ground must be reasoned in relation to the offence and on the individual facts; a blanket reasoning based on the abstract seriousness of the allegation is not enough.

The four grounds differ clearly in structure. Risk of flight and risk of collusion safeguard the ongoing proceedings: they prevent the accused from evading the authorities or damaging the evidence. Risk of repeated offending and risk of execution, by contrast, serve the preventive protection of the public, or of specific persons, from further offences. Once the system is understood, it quickly becomes visible which ground carries weight in which phase of the proceedings, and where the defence can make a concrete start.

Risk of flight (Section 173(2)(1) StPO)

Risk of flight exists where specific facts suggest that the accused will evade the criminal proceedings by fleeing or going into hiding. According to settled case-law, the prospect of a heavy sentence alone is not decisive (OGH 13 Os 81/07x); objective indications must be added, for example preparations for flight, documented contacts abroad, or specific means and routes for flight. Classic indicators are a concrete foreign nexus (foreign citizenship, residence or assets abroad) and the absence of family and professional ties in Austria.

Foreign citizenship alone is not enough. The Supreme Court (Oberster Gerichtshof) has clarified that integration in another EU member state may equally count in favour of domestic-equivalent ties capable of rebutting the presumption (OGH 11 Os 31/08f): a person firmly anchored socially and professionally in another EU state can no more evade criminal justice than someone anchored in Austria, because European mutual legal assistance instruments make reliable apprehension possible.

In practice, the defence assembles a catalogue of evidence: residence registration, tenancy contract or land register extract, employment contract with a recent payslip, employer confirmation of continuing employment, school confirmations for the children, evidence that relatives depend on care. The more densely the network of domestic ties is documented, the harder it becomes to reason a risk of flight. Typical safeguards alongside this are: deposit of the passport with the court, regular reporting at a police station and, where the financial circumstances allow it, bail (Kaution) agreed with the court as to amount and form.

Statutory presumption against risk of flight (Section 173(3) StPO)

A provision often overlooked in practice: Section 173(3) StPO contains a statutory presumption against risk of flight. Where the offence carries a maximum sentence of no more than five years, where the accused lives in orderly circumstances, and where they hold a fixed place of residence in Austria, the law presumes that no risk of flight exists. In this constellation the court may assume a risk of flight only if concrete preparations for flight are demonstrable, for example a documented purchase of a flight ticket, the clearing-out of the residence, the withdrawal of substantial sums of money, or documented preparatory acts abroad.

For the defence, this presumption is a sharp instrument. Anyone able to establish the three preconditions (maximum sentence of up to five years, orderly circumstances, fixed domestic residence) reverses the burden of argument: the accused no longer has to prove their domestic ties, the prosecution has to demonstrate concrete preparations for flight in order to rebut the presumption. Blanket assertions such as "given the sentence at stake, there is risk of flight" do not, as a rule, hold up against Section 173(3) StPO.

Risk of collusion (Section 173(2)(2) StPO)

Risk of collusion means the danger that the accused will destroy, alter or hide away evidence, influence witnesses or co-accused, or remove traces. The ground requires concrete indications to that effect; abstract possibilities, conceivable in any proceedings, are not enough. Risk of collusion is the typical ground for detention in the early investigative phase, while the file is still thin, witnesses not yet interviewed and electronic evidence not yet secured.

One point is settled: denial or silence is not a ground for detention (OGH 12 Os 7/10m). The right to remain silent under Sections 7(2) in conjunction with 49(4) StPO must not be held against the accused. A person who exercises the right not to make a statement does not, by that exercise alone, create a risk of collusion; the familiar reasoning "the accused remains silent, therefore wants to hide the truth, therefore collusion is feared" turns the right to silence on its head and is legally untenable.

For that very reason, risk of collusion carries less weight as the proceedings progress. It typically falls away once all key witnesses have been interviewed or where there is a comprehensive confession: once witnesses have been interviewed, data carriers examined and searches completed, there is simply nothing left to conceal. The defence typically starts here: it demonstrates that the investigatively relevant evidence has already been secured and applies for release on the basis that the purpose of detention has been achieved. Concrete undertakings by the accused, handing over data carriers or renouncing contact with named witnesses, can likewise suffice as a less intrusive measure.

The personnel constellation also matters: risk of collusion presupposes that the accused actually has the means to exert influence. If the only incriminating witness is themselves in custody or lives in an entirely separate sphere, the real possibility of influence is often missing. Equally important: risk of collusion justifies detention only for as long as it genuinely exists. Where the court simply carries it over in a later review hearing without the evidentiary situation having changed, that is a classic point of attack in the detention appeal (Haftbeschwerde).

Risk of repeated offending (Section 173(2)(3) lit a–c StPO)

The risk of repeated offending is set out in three variants under Section 173(2)(3) lit a to c StPO. Lit a: following an offence with serious consequences, it is to be feared that the accused will commit a further offence with serious consequences directed against the same legally protected interest. Lit b: following an offence with more than merely trivial consequences, it is to be feared that the accused will repeat or continue such an offence, provided that a relevant prior conviction exists or that the offence has been committed repeatedly or in a continued manner. Lit c: where the offence carries a sentence of more than six months, it is to be feared that the accused will commit such an offence, provided that there are two relevant prior convictions for offences arising from the same harmful inclination.

The central threshold concepts have been further shaped by case-law. "Serious consequences" cover death, serious bodily injury within the meaning of Section 84 StGB (Strafgesetzbuch / Criminal Code) and pecuniary damage from around EUR 50,000 upwards; the trend since BGBl I 2015/112 is towards around EUR 300,000 in pure property cases. "More than merely trivial consequences" are present in cases of bodily injury with a healing time of more than 14 days, in cases of pecuniary damage above the trivial threshold and, for example, in cases of a large quantity of narcotics within the meaning of Section 28b SMG (Suchtmittelgesetz / Narcotics Act).

Relevant prior convictions alone do not support the ground. The court must form a concrete prognosis and set out why, in the present situation, there is a risk of repetition. An important point: the presumption of innocence under Article 6 ECHR protects against a finding of guilt, not against a prognosis decision. The "specific facts" on which the court bases the risk of repeated offending may therefore include findings from the ongoing proceedings or documented earlier patterns of conduct without violating the presumption of innocence.

The defence works here with evidence of changed circumstances of life: a therapy placement, withdrawal treatment, a stable job, integration into a family. The temporal dimension weighs heavily: a prior conviction from 2015 counts differently for today's prognosis than a relevant conviction from the previous year. The nature of the current allegation counts too, a one-off, situational incident supports a prognosis of further offences less readily than a documented series. Where the defence presents a credible forward-looking perspective, a concrete therapy placement, a confirmation of employment and a stable domestic environment, the ground often loses its load-bearing capacity. The electronic ankle tag (Fußfessel) is a further option which, in cases of addiction combined with a therapy directive, can become an effective instrument of control.

Risk of execution (Section 173(2)(3) lit d StPO)

The risk of execution is set out in Section 173(2)(3) lit d StPO and, in systematic terms, is a variant of the risk of repeated offending, although it is assessed independently in practice. It covers the completion of an attempted offence or the execution of a threatened offence within the meaning of Section 74(1)(5) StGB. The ground therefore presupposes a specific offence that has been threatened or already attempted, typically a serious threat against a concrete person.

In practice, risk of execution is rarely the load-bearing ground; it usually appears alongside other grounds and serves as a safety net in cases where threats are documented. Where it is argued, the concreteness of the announced offence is decisive: whom does the accused threaten? With what act? How credible is the announcement on the state of the file? General outbursts of anger, or distant threats uttered in a heated moment, regularly do not justify detention. Possible less intrusive measures include a contact ban in respect of the person threatened, a directive to undergo therapeutic work-through, or electronically monitored house arrest.

Conditionally mandatory pre-trial detention (Section 173(6) StPO)

For particularly serious offences, Section 173(6) StPO mandates conditionally mandatory pre-trial detention. Where the offence carries a minimum sentence of ten years or more, the typical example being murder under Section 75 StGB, pre-trial detention must be ordered. This duty falls away only if the exclusion of all grounds for detention can be assumed with a probability bordering on certainty, which is a very high threshold.

Even in such cases the principle remains that substitution by less intrusive measures is in principle possible. In practice, substitution rarely comes into play because the grounds for detention in the most serious criminality regularly stand. Even so, an application for a less intrusive measure is admissible here too and must be examined seriously by the court.

Important for the defence of juveniles and young adults: Section 173(6) StPO is not applicable to these groups. Sections 35(1b) and 46a(2) JGG (Jugendgerichtsgesetz / Juvenile Court Act) expressly exclude conditionally mandatory detention for juveniles and young adults, so that even in offences carrying a ten-year minimum sentence the full proportionality test applies.

Concreteness and individual case focus

Running through all the grounds is the same requirement: the reasoning must be concrete, related to the offence and individually tailored. Sentences such as "given the seriousness of the allegation, risk of flight is given" or "in drug offences there is typically a risk of repeated offending" are blanket reasonings and, as a rule, do not survive a detention appeal. The Supreme Court demands engagement with the personal circumstances, with the concrete facts of the offence and with possible less intrusive measures.

An important strategic point follows: if the defence succeeds in unsettling even one of the grounds hitherto assumed, that may support release, provided the remaining grounds do not stand on their own. More often, the path ends not in full release but in a less intrusive measure: bail, directives, ankle tag. That is a full success, too. In practice, both lines are worth preparing in parallel: the detention appeal attacks the reasoning on the merits, while the application for a less intrusive measure offers the court a viable way out it can choose without losing face.

Practical tip: Where several grounds for detention stand side by side, it is pointless to attack only one of them in the appeal or in the constitutional appeal on fundamental rights (Grundrechtsbeschwerde). The accused could nevertheless not be released, because the remaining grounds would still stand and continue to carry the detention. A promising appeal addresses all the load-bearing grounds and must set out, for each one, why it either does not carry from the outset or can be replaced by a less intrusive measure. Anyone arguing selectively here forfeits the chance of release.

The deadlines are equally strict. An appeal against the first imposition of pre-trial detention must be lodged within 14 days of service of the written copy of the detention order, which is to be served at the latest within 24 hours of pronouncement. For subsequent decisions under Section 176(5) StPO, the deadline shortens to 3 days from pronouncement. Missed deadlines are lost; the next opportunity to attack arises only at the next detention review hearing.

What our firm does

We examine the detention order word by word, put every single ground to the test and work out concrete counter-evidence, from proof of residence through confirmation of therapy to arranging bail. For the overall proceedings see our pre-trial detention topic; the defence in the main proceedings runs in parallel through strafsachen.at.