The term Alibi, derived from Latin and translated literally as "elsewhere," constitutes a fundamental institute of Criminal Procedural Law. It is an indirect defense thesis through which the accused alleges the physical impossibility of having participated in the criminal offense, based on their presence in a location other than where the typical fact occurred at the exact moment of its consummation, aiming to exclude criminal authorship.
1. Definition, Concept, and Legal Nature
In the national legal system, an alibi is understood as evidence of a negative character regarding authorship. It differs from a generic denial of authorship because, while the latter is limited to denying participation in the event, the alibi introduces a positive impeding fact: the defendant's presence at different geographical coordinates, which makes the execution of or participation in the crime logically impossible.
The legal nature of an alibi is that of a defensive means of proof, falling within the context of indirect defenses. It does not seek to deny the existence of the fact (materiality), but rather to demonstrate the unfeasibility of the imputation in the face of a factual circumstance that excludes presence.
2. Historical Origin and Evolution in Law
The expression dates back to Roman Law, where proof of absence (prouve de l'absence) was used to deconstruct the presumption of guilt. Historically, the alibi evolved from strictly testimonial evidence to complex evidence, which today encompasses technological and telematic data.
In Comparative Law, especially in the Common Law system, the alibi is often treated as an "affirmative defense," requiring the defense to notify the prosecution in advance of the intention to use it (Notice of Alibi). In Brazil, the system adopted is that of freedom of evidence and reasoned conviction, with no requirement for prior notification, although its late presentation may influence the magistrate's assessment of the credibility of the evidence.
3. Legal Provision and Normative Framework
The institute of the alibi finds its primary foundation in the Code of Criminal Procedure (CPP) and the 1988 Federal Constitution:
- Article 156 of the CPP: Establishes that "the burden of proving an allegation shall lie with the person who makes it." This is the central provision governing the distribution of the burden of proof regarding an alibi.
- Article 5, item LV, of the CF/88: Guarantees the adversarial system and full defense, ensuring the defendant the right to produce all lawful evidence to demonstrate their innocence, including an alibi.
- Article 5, item LVII, of the CF/88: Principle of Presumption of Innocence (or non-guilt), which serves as an interpretive vector for the valuation of an alibi in criminal proceedings.
4. Practical Application and Jurisprudential Understanding
The jurisprudence of the Superior Courts (STF and STJ) has consolidated the understanding that, once an alibi is alleged, the burden of proving it falls upon the defense, under the terms of Art. 156 of the CPP. However, this interpretation must be mitigated by the in dubio pro reo principle.
The Superior Court of Justice (STJ) has repeatedly decided that: "The allegation of an alibi formulated by the defendant transfers to them the burden of proving it, and there is no room to speak of an improper reversal of the burden of proof" (AgRg in AREsp 1,956,123/SP). However, modern doctrine and more protectionist decisions note that if the alibi generates reasonable doubt in the magistrate regarding authorship, acquittal is mandatory, as the primary burden of proving the accusation in all its terms remains with the Public Prosecutor's Office.
Within the scope of the Superior Labor Court (TST), although the term is typical of Criminal Law, the concept is transposed to Labor Law in cases of just cause for acts of dishonesty or aggression, where the employee uses time clock records or geolocation to demonstrate that they were not at the location of the incident alleged by the employer.
5. Related Principles and Doctrinal Divergences
The study of the alibi involves the clash between two fundamental principles:
- Nemo tenetur se detegere: The right not to produce evidence against oneself. Some scholars argue that requiring the defendant to prove an alibi under penalty of conviction would violate this precept.
- Reasoned Conviction: The judge has the freedom to evaluate the probative force of the alibi but must justify why they accepted or rejected the evidence (e.g., contradictory testimonies or GPS records).
The main doctrinal divergence lies in the intensity of the burden of proof. The classical school argues that the defendant must prove the alibi fully. The protectionist school (led by authors such as Aury Lopes Jr.) maintains that it is sufficient for the defendant to raise doubt; if the prosecution cannot destroy the possibility of the alibi, the doubt must favor the accused.
6. Contemporary Relevance and Technological Impacts
In contemporary times, the institute of the alibi has undergone a revolution with the advent of digital evidence. The so-called "Digital Alibi" is today one of the most effective tools of technical defense. Examples include:
- Geolocation data from mobile devices (GPS and cell towers);
- Records of bank transactions and credit card usage at times concurrent with the crime;
- Images from monitoring systems (CCTV) and biometrics in controlled access locations;
- Social media activity and internet server access logs.
These elements give the alibi a technical objectivity that overcomes the fragility of testimonial evidence, significantly reducing the margin of judicial error and reinforcing the legal certainty of the procedural system.
Legal and Jurisprudential References
- BRAZIL. Constitution of the Federative Republic of Brazil of 1988. Brasília, DF.
- BRAZIL. Decree-Law No. 3,689, of October 3, 1941. Code of Criminal Procedure.
- SUPERIOR COURT OF JUSTICE. Internal Interlocutory Appeal in Special Appeal No. 1,956,123/SP. Rel. Min. Joel Ilan Paciornik, Fifth Panel, judged in 2022.
- LOPES JR., Aury. Criminal Procedural Law. 19th ed. São Paulo: Saraiva, 2022.
- PACELLI, Eugênio. Criminal Procedure Course. 26th ed. São Paulo: Atlas, 2022.
