Living with a Drug Trafficker Is Not Enough to Convict for Drug Trafficking

STS 85/2026, of 5 February 2026 (appeal 6855/2023), delivered by the Second Chamber of the Spanish Supreme Court, acquits a woman who had been convicted of a public-health drug offence under Article 368 of the Criminal Code solely on the basis of having lived with a trafficker and having known of and tolerated his activity. The ruling sets a reference standard on the limits of criminal liability through association in drug-trafficking offences.

Knowledge is not the same as participation

The core of the doctrine is clear: knowing that someone is trafficking is not the same as taking part in the trafficking. The Chamber stresses that Article 368 of the Criminal Code requires active conduct of promoting, favouring or facilitating the illegal consumption of drugs. Awareness of the activity and tolerating it do not, by themselves, satisfy any of those statutory verbs. To convict, it is not enough to show that the defendant was aware of what was happening around them; it is necessary to prove that they carried out specific acts that contributed, even in a secondary way, to furthering the trafficking.

This principle is not new, but the judgment restates it with particular clarity in a context — the shared home with the trafficker — where trial courts tend to make the argumentative leap from proximity to co-authorship or complicity without adequate factual justification.

The factual gap in the proven facts

The Chamber also identifies a serious descriptive gap in the facts declared proven by the conviction. The proven facts merely placed the defendant in the home and stated that she knew of and tolerated the trafficker's activity; they did not describe any act of her own capable of being characterised as favouring or facilitating. This factual void is decisive: a conviction under Article 368 of the Criminal Code cannot be built on facts that omit the conduct element that gives life to the offence.

The procedural consequence is significant: once the descriptive gap in the proven facts is identified in cassation, the Supreme Court may uphold the appeal and deliver a direct acquittal, without sending the case back for retrial, where a fresh factual review would no longer contribute any element capable of supporting a conviction.

Charges based on association in drug-trafficking cases

Drug-trafficking cases frequently give rise to charges against people in the trafficker's circle — partners, cohabiting family members, people sharing the same home — who have not intervened directly in the trafficking but whose proximity generates suspicion. STS 85/2026 is a useful reference for building the defence in these situations.

The prosecution must establish precise facts: custody of the substance or the money, surveillance activities, transport, intermediation with buyers or any other contribution that has autonomous meaning in the distribution chain. Invoking cohabitation or presumed awareness is not enough. The defence thus has a solid argument to challenge both the legal classification and the adequacy of the proven facts where the conviction rests solely on proximity to the trafficker.

Commission by omission and Article 11 of the Criminal Code

In some cases the prosecution builds the cohabitant's liability through Article 11 of the Criminal Code, which governs commission by omission. The argument is that the cohabitant had a legal duty to prevent or report the trafficking and that their inaction amounts to an omissive contribution to the offence.

The Supreme Court's doctrine requires three elements to find Article 11 satisfied: the existence of a duty of care of the defendant towards the protected legal interest, a specific duty to act, and a causal link between the omission and the result. A mere cohabitation relationship or emotional bond does not by itself create a duty of care in relation to drug trafficking. A cohabitant has no general legal duty to prevent another person from committing a crime; such a duty would only exist if special circumstances were present — circumstances the prosecution must identify and prove.

Practical significance for the defence

STS 85/2026 provides several levers for the defence in drug-trafficking cases based on association:

• Challenging the factual account where the proven facts describe only cohabitation and awareness, without identifying specific acts of facilitating by the defendant.
• Contesting the legal classification under Article 368 of the Criminal Code where no conduct of promotion, favouring or facilitating attributable to the defendant can be identified.
• Raising insufficiency of evidence by invoking the presumption of innocence, where the prosecution evidence merely establishes proximity to the trafficker without evidence of specific acts.
• Refuting commission by omission under Article 11 of the Criminal Code where the prosecution does not identify or prove the elements of the duty of care and the specific duty to act.

These arguments apply not only in cassation but also in appeal before the Provincial Court and, where appropriate, at the investigation stage, to challenge the soundness of the charge from the outset.

Statutory framework: Articles 368 and 11 of the Criminal Code

Article 368 of the Criminal Code punishes those who carry out acts of cultivation, manufacture or trafficking in substances that cause serious harm to health, as well as those who otherwise promote, favour or facilitate their illegal consumption. The penalty varies according to whether the substance causes serious or non-serious harm to health and may be aggravated where the circumstances of Article 369 of the Criminal Code are present. Article 11 of the Criminal Code, for its part, allows a criminal result to be attributed to a person who omits the action indicated to prevent it where they occupy a position as duty-bearer and the omission is equivalent, in its substantive content, to actively bringing about the result.

STS 85/2026 does not modify these provisions, but it rigorously defines the factual requirements that must be present for cohabitation with a trafficker to give rise to criminal liability under either route. That factual and legal rigour is what the defence must demand in every case.