Upon its entry into force, the General Code of Procedure imposed, as a legal duty, the judicial evidentiary initiative. However, the regulatory structure is incomplete or imprecise, as the criteria for the fulfillment of such duty is absent. This lacuna has generated a grey area that causes both practical difficulties in the application of this duty, and doubts on parties regarding the impartiality of the judge who is nearing their case. For this reason, we intend to present sorne statutory and jurisprudential parameters, beyond the limits imposed by the rights of defense, contradiction and due process. To that end, we will place this evidentiary initiative in context, and we will then address the proposed parameters after conducting an analysis of statutory principies and jurisprudence. Finally, we conclude that clespite the lack of specific criteria, these referential points do exist and are intended to contribute as a starting point for a judge to order the gathering of evidence sua sponte.