Criminal act It can no longer be treated as an “automatic” phrase to justify a arrest warrant or a order to proceed to trialSince March 2026, a mandatory criterion emphasizes that, by last ratio and the guarantor function of the criminal type, the Prosecutor's Office must provide minimum test data that show in fact the basic characteristics of the alleged crime, before affecting freedom (article 16 of the Constitution).
In practice, this standard reorders the debate: it is not enough to narrate, one has to minimally checkFor companies and individuals under investigation in Mexico City, this opens a clear defensive avenue to combat "generic" accusations and, at the same time, compels them to strengthen compliance strategies and evidence management.
1) What changed in 2026: “criminal act” as the minimum verifiable factual element
The widely disseminated criterion as “CRIMINAL ACT. ITS BASIC CONNOTATION IN LIGHT OF THE PRINCIPLES OF LAST RESORT AND GUARANTEE FUNCTION OF THE CRIMINAL TYPE” It upholds an operational idea: the “criminal act” of Article 16 of the Constitution requires a minimum evidentiary sufficiency that shows, in the factual world, a behavior with basic features of the criminal offense preliminarily attributed. That burden falls on the Prosecutor's Office and is essential requirement both for arrest warrant as for link to process, due to its direct or indirect impact on freedom.
Why does it matter for an arrest warrant (art. 16 CPEUM)
Article 16 of the Constitution requires (among other things) that get data that establish that the act has been committed and that there is a probability of participation.
The point of criterion 2026 is that this “fact” cannot be an empty label: it must have minimum anchorage in test data that show the basic materiality of typical behavior.
Why does it matter for indictment (art. 316 CNPP)
Article 316 of the CNPP requires evidence establishing that an act defined as a crime by law was committed, understanding that such evidence exists when there is reasonable indications that allow one to suppose.
The 2026 criterion pushes for those “reasonable indications” to translate into verifiable factual features of the criminal type, not only in broad inferences.
2) Date of mandatory nature and actual procedural scope
This criterion was published in the Weekly March 6, 2026 and it was considered mandatory application from 9 March 2026.
Practical scope:
- It becomes a control parameter for control judges when analyzing arrest requests and to resolve link to process.
- The cost of litigating with "textbook" charges increases: if the prosecution does not ground the criminal offense in verifiable facts, the defense has a technical argument to deny, revoke o protect.
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3) The core of the criterion: last resort + guarantee function of the criminal type
The criterion explains that criminal law, being last ratioIt must be used with a reinforced standard when the procedural act affects liberty. Furthermore, the guarantee function of the criminal type requires that only the commission of conduct typified (and not “similar”) justify intense measures such as apprehension or continuation of the process.
What does “guarantee function” mean in litigation language?
In court proceedings, the "guarantee function" translates into control:
- Delimit the punishable conduct (what is and is not included in the type).
- Demand that the Prosecutor's Office show basic facts that coincide with that framework.
- To prevent the process from being used as an "extended investigation" with already restricted freedom.
Last resort as a minimum evidentiary standard, not as discourse
The criterion does not say "prove the complete crime" at the initial stage. It says: contribute the minimum verifiable amount of the type charged, because the State is using its most powerful tool. That difference is key: it's not a request for an early sentence, it's a demand. factual floor.
4) Arrest warrant: where the Prosecutor's request breaks with this standard
In the CNPP, the judge can order a summons, appearance, or apprehension When a complaint is filed, the Public Prosecutor's Office announces data that establishes the criminal act and the probability of authorship, and—for apprehension— need for caution.
Using the 2026 criterion, typical vulnerable points are:
A) “Generic” facts without typical features
Example: “seized resources”, “defrauded”, “threatened”, “altered documents”, without describing as, when, with what medium, with what resultand without supporting data. The standard requires showing basic characteristics of the type (conduct/object/result relevant to the crime).
B) Inferential leaps without hard data
When the Prosecutor requests arrest with inferences (“because of his position he should have known”, “he had access”, “he is an administrator”), without minimal external data (traceability, messages, preliminary expert reports, records, witnesses with verifiable context).
C) “Need for caution” as a crutch
Although the criterion focuses on "criminal act", in practice it requires reviewing whether the apprehension is being used to drive without basic factual support. If the "fact" is weak, the caution becomes disproportionate.
Typical business risk (CDMX): Internal complaints or those from former employees that escalate to a formal case file; if the company fails to preserve evidence and a clear narrative, the prosecution can fill in the gaps with assumptions. This criterion makes it more cost-effective to litigate the standard from the outset.
5) Linking to the process: the debate is no longer just a probability of participation
Article 316 CNPP requires evidence of the criminal act and the probability of intervention.
The 2026 criterion strengthens the first component: criminal act as verifiable minimum factual of the basic characteristics of the crime.
How to use it strategically in initial audiences:
- Separate The discussion: first “criminal act” (factual basis), then “probability”.
- Ask the judge to identify what basic typical features They are considered satisfied and with what information (not with what “said”).
- Attacking the “minimum typicality” when the imputation is narrative but not verifiable.
Common defensive mistakes (that you should avoid):
- Discussing “innocence” or “full proof” (is not the standard).
- To go straight to subtle contradictions without first addressing the lack of basic features of the type.
- Do not tie the argument to the impact on freedom (precautionary measures, appearances, reputational restriction, etc.).
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6) Tactical checklist: what the prosecution should provide and what the defense should demand
This criterion functions as a litigable checklist.
The minimum that must exist (depending on the crime)
Without inventing “universal lists”, the logic is: basic features of the type + minimum test data that makes them verifiable.
Examples of “minimum verifiable” (in the abstract):
- Assets: traceability of disposal, specific impact, base document/record, identification of the asset/value.
- Documentaries: existence of the document, attributed intervention, preliminary expertise or verifiable objective feature.
- Threats/violence: context, medium, basic content, temporality, objective element that supports the claim.
How to structure a defensive objection
- “Your Honor, even if the narrative is granted for now, no minimum data that factually demonstrate the basic characteristics of criminal type X; due to its guarantee function and as a last resort, freedom cannot be affected by an unverifiable fact.”
Risk: that the judge “supplants” the standard
The real danger is that the judge will mentally "fill in the gaps" left by the prosecution ("it sounds like fraud"). This criterion provides grounds for demanding a more thorough ruling. methodical: typical feature + fact.
7) Impact on companies: criminal compliance and evidence management from day 1
For companies (fintech, retail, construction, logistics, pharma, tech) the 2026 standard has two interpretations:
1) More powerful early defense
If the case file was built with vague testimonies or disconnected documents, the defense can halt the arrest/indictment with an approach of verifiable minimum typicality.
2) Greater internal demands
Companies must quickly build their "verifiable factual explanation":
- Preservation of emails/chats, logs, accounting records.
- Internal chain of custody (without replacing the authority, but avoiding destruction/alteration).
- Internal research protocols (to avoid creating contradictions that could later be used as "facts" against the company or its executives).
Frequent gray area: Poorly documented internal investigations that create “facts” without technical support. The 2026 criterion rewards accuracy and penalizes narrative.
8) Protection strategy: when this criterion is decisive
Judgment itself is built in scenarios of arrest warrant and link to process, and states that Article 16 requires that minimum threshold.
When is it usually decisive:
- When the judicial resolution does not identify what data support the basic characteristics of the crime.
- When the Public Prosecutor "announces" data, but in court it does not translate into verifiable facts.
- When the resolution relies on standard phrases (“reasonable indications”) without explanation indicios de qué.
How this translates into procedural risk for the Prosecutor's Office:
- Higher probability of revocation/denial,
- Greater exposure to protection due to insufficient motivation,
- Greater pressure to "strengthen" cases before requesting restrictive measures.
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Conclusion
The mandatory criterion of March 2026 redefines the concept of criminal act in its correct place: a verifiable minimum factual that the Prosecutor's Office must show to justify measures that impact freedom, consistent with the last ratio and the guarantor function of the criminal type.
For criminal defense (and for business risk management) the message is clear: litigation is no longer won with rhetoric; it is won by forcing the criminal type to land on verifiable basic facts, from the first act that intends to restrict rights.
FAQs (Mexico) — Snippet-type answers (45–60 words)
1) What is a “criminal act” for the purposes of an arrest warrant?
The reported fact is that la ley señala como delito, supported by data that allow establishing what occurred and that there is a probability of participation. The constitutional standard derives from Article 16 of the Mexican Constitution and is operationalized in the National Code of Criminal Procedure. In 2026, it was emphasized that there must be a verifiable minimum of facts.
2) Does the prosecution have to prove the entire crime in order to bring charges?
No. For linkage, the CNPP requires test data e reasonable indications, not conclusive proof. However, there must be a verifiable minimum of the basic features of the imputed crime, in accordance with the mandatory criterion of 2026 and article 316 CNPP.
3) What happens if the arrest warrant is based on generic facts?
If the application and the resolution do not show minimum data that factually demonstrate the basic characteristics of the crime, a violation of article 16 CPEUM can be argued due to the insufficiency of the "criminal act", and judicial control or protection can be sought as appropriate.
4) Since when is the criterion “CRIMINAL ACT. ITS BASIC CONNOTATION…” mandatory?
It was published on March 6, 2026 and it was considered mandatory from March 9, 2026, according to the Gazette of the Judicial Weekly of the Federation. This impacts decisions regarding arrest and indictment.
5) How does Article 141 of the CNPP relate to the “criminal act”?
Article 141 of the CNPP allows for summons, appearance, or arrest when there is a complaint/accusation and the Public Prosecutor presents information establishing the criminal act and the probability of authorship; for arrest, there is also a need for precautionary measures. Criterion 2026 requires that this “act” have a minimum verifiable factual basis.
6) What should the defense request in the hearing to apply this standard?
It must require the judge to identify what basic features of the criminal type are considered satisfied and with what information specific, avoiding generic motivations. The basis is in article 16 CPEUM, 316 CNPP and the mandatory criterion of 2026 on “criminal act”.
References (official) + latest reform
- Political Constitution of the United Mexican States (Last amendment DOF 06-05-2026) — Chamber of Deputies — https://www.diputados.gob.mx/LeyesBiblio/pdf/CPEUM.pdf
- Código Nacional de Procedimientos Penales (Última reforma DOF 28-11-2025) — Cámara de Diputados — https://www.diputados.gob.mx/LeyesBiblio/pdf/CNPP.pdf
- Gaceta del Semanario Judicial de la Federación, Marzo 2026 (incluye nota de obligatoriedad 6/03/2026 y 9/03/2026) — SCJN — https://www.scjn.gob.mx/sites/default/files/gaceta/documentos/2026-03/1_07_MAR_SEM1.pdf
Disclaimer: This article is for informational purposes only and does not constitute legal advice or an attorney-client relationship.
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