Introduction

Legislative omission, often understood merely as a gap or failure on the part of the legislator, can also be employed intentionally, constituting a legitimate legislative technique. By not regulating a particular matter exhaustively, the legislator leaves room for the interpretation and application of the law to be shaped by social reality, cultural evolution, and, above all, the actions of the courts. This phenomenon, however, has profound implications for the balance of power and for legal certainty, especially in contexts of judicial activism or increasing protagonism of the judiciary.

The aim of this text is to examine omission as a legislative technique, differentiating it from unconstitutional or undue omission, and to discuss how this legislative strategy impacts the role of the Judiciary, often leading to a significant expansion of its normative and political function.

1. What is omission as a legislative technique?

Omission as a legislative technique consists of the legislator's deliberate choice not to fully regulate a particular matter, leaving normative gaps open. This choice can occur for different reasons.

Interpretive flexibility allows, by avoiding normative rigidity, for the norm to be adapted to multiple situations by the legislator. Furthermore, in rapidly evolving areas such as digital or environmental law, the absence of exhaustive regulation prevents premature obsolescence.

In cases of rapid evolution, it is necessary to observe the values ​​that govern the law. Instead of meticulously detailing conduct, the law may refer to broad values ​​or guidelines, relying on subsequent interpretative action.

In this sense, technical omission is not synonymous with unintentional gaps or negligence, but a form of "open normativity," the filling of which depends on judicial interpretation, administrative regulation, or doctrinal development.

2. Difference between technical omission and unconstitutional omission

It is important to differentiate between omission as a legislative technique and unconstitutional omission. The latter occurs when the legislator fails to enact an essential norm to make a fundamental right enforceable or to comply with an express constitutional mandate. A typical example is laws that should regulate constitutional provisions of limited effectiveness and whose absence prevents the enjoyment of the right.

In the case of technical omission, the core of the right is protected and operationalized, but the legislator chooses not to exhaustively define its application scenarios. In unconstitutional omission, there is a normative deficit that generates concrete injury or threat to rights, subject to concentrated control through actions such as the Writ of Mandamus or the Direct Action of Unconstitutionality by Omission (ADO).

This distinction is crucial because, in the first case, the omission stems from a legitimate normative strategy; in the second, it constitutes an affront to the Constitution and demands an institutional response.

3. Political and legal reasons for the use of omission

Legislators may resort to omission as a technique for distinct political and legal reasons. In polarized issues, detailed regulation may prevent the approval of a bill. The adoption of open concepts allows different groups to accept the text, leaving its implementation for the future.

Furthermore, deliberate omission transfers part of the normative implementation to other branches of government, distributing responsibilities to other agents. By avoiding excessive detail, the legislator reduces the risk of obsolescence and simplifies the normative structure.

However, this strategy can generate undesirable side effects, such as legal uncertainty, excessive litigation, and a weakening of the Legislative branch itself.

4. The role of the Judiciary in filling the gaps

When the legislature opts for an open or incomplete norm, the Judiciary acts as an interpreter and implementer of the underlying principles and values. This can occur in the following ways:

1. Normative: By establishing binding understandings (for example, through summaries, general repercussion theses or IRDR themes);
2. Case studies: When resolving specific situations that will serve as precedents; and
3. Proactive: By addressing unconstitutional omissions with temporary solutions until legislative regulation is enacted.

In constitutional democracies, this action is inevitable, since the practical application of general principles requires interpretative choices. The problem arises when the Judiciary ceases to limit itself to implementation and begins to substantially innovate in the legal order, assuming functions that would normally belong to the Legislative branch.

5. The expansive role of the judiciary: activism or inevitable protagonism?

Legislative omission, especially when repeated or politically convenient, can lead to an expansive judicial role. This phenomenon is visible in various areas of Brazilian law:

1. Fundamental rights: The Brazilian Supreme Federal Court (STF) has already recognized same-sex unions, decriminalized certain conduct, and established parameters for public policies in the absence of specific legislation; 
2. Environmental law: The Court has established concrete obligations for the Public Authorities in the face of omissions in climate policies, basing its decisions on the most appropriate constitutional interpretation; and
3. Electoral law: Interpretations regarding party loyalty, gender quotas, and combating disinformation have been shaped largely by judicial decisions, not by clear laws.

The central debate is whether this protagonism is judicial activism – characterized by exceeding institutional limits – or simply the result of a constitutional design that confers upon the Judiciary a guarantor role in the face of legislative omissions.

6. Risks and benefits of expanding the role of the judiciary

The expansion of the Judiciary's role has advantages and disadvantages that need to be weighed. The protection of fundamental rights, aimed at preventing setbacks and realizing constitutional guarantees; the updating of the law and a rapid response to social and technological changes; and institutional pressure to induce the Legislature to act, are some of the benefits of judicial intervention in the face of these omissions.

However, a number of risks are observed, such as a democratic deficit, since judges are not elected, and their decisions with a significant social impact, taken without parliamentary debate, can weaken the legitimacy of the system. Furthermore, depending on the composition of the court or the evolution of jurisprudence, understandings can change rapidly. Finally, issues that should be resolved by elected representatives migrate to the judicial arena.

7. Pathways to institutional balance

The balance between legislative omission as a technique and the role of the Judiciary requires some care.

Initially, the legislator must expressly indicate when a rule is open-ended due to technical reasons, reducing room for interpretations based on inertia. Furthermore, tools such as injunctions and writs of mandamus need to be applied swiftly, avoiding long periods without regulation.

It is important to highlight that the Judiciary can issue modulated decisions, granting time for legislative action before imposing definitive solutions. For greater effectiveness, public hearings and consultations are instruments that lend legitimacy to judicial decisions on highly relevant issues.

8. Illustrative examples

We can highlight 3 (three) agendas in which the Supreme Federal Court addressed matters on which the Legislative Branch was silent:

1. Same-sex civil unions (STF, ADPF 132 and ADI 4277) – The Constitution guaranteed protection for the family, but without detailing all forms of union. Congress did not legislate on same-sex unions, and the STF filled the gap with a broad interpretation.
2. Party loyalty (MS 26.602 and related cases) – There was no law regulating the loss of mandate due to party switching. Faced with this omission, the Supreme Federal Court established the principle that the mandate belongs to the party in the proportional representation system.
3. Climate policy (ADPF 708) – Faced with the Executive's inaction and the absence of clear regulations, the Supreme Federal Court (STF) determined specific measures to operationalize the Climate Fund.

These cases show that legislative omission can be an opportunity for judicial innovation, but also a source of debate about the limits of constitutional jurisdiction.

Conclusion

Omission as a legislative technique is a legitimate resource and, in many cases, necessary for the creation of adaptable and lasting laws. However, when this omission goes beyond the limits of strategy and becomes unconstitutional inertia, it opens the door to expansive judicial action that alters the balance of power.

The challenge lies in establishing clear boundaries: the Judiciary must act as a guarantor and implementer of rights, but without replacing the democratic political process. At the same time, the Legislature needs to assume its normative function, avoiding systematically transferring responsibility for structural decisions to the Judiciary.

The conscious use of technical omission, combined with mechanisms of institutional control and social participation, can preserve the legitimacy of the system, ensuring that the space left by the legislator is filled with balance, responsibility, and respect for the principle of separation of powers.

BIBLIOGRAPHIC REFERENCES

BRAGA, Amanda Queiroz. The expansion of judicial activity as a form of displacement of representative authority analyzed from the perspective of the 1988 Federal Constitution. Revista de Direito, v. 17, n. 02, p. 01-30, 2025.

CAPORAL, Hugo Chavez et al. The role of judicial activism in fundamental rights and guarantees and its limits in the face of the omission of the executive and legislative branches. 2021.

DA SILVA LIMA, Evelly. Judicial Activism in the Face of Unconstitutional Legislative Omission. IURIS NOVARUM Journal - ISSN 2764-247X, v. 3, n. 2, 2023.

NOGUEIRA, Millena Alves. Legal-constitutional analysis of the criminalization of homophobia: from legislative omission to judicial activism. 2019.

SILVEIRA, Daniela Gonsalves da. The legitimacy of the Supreme Federal Court to protect fundamental rights in the face of legislative omission. 2016.