Under Rule 3.4, which action is prohibited concerning evidence?

The prohibition under Rule 3.4 of the Model Rules of Professional Conduct specifically addresses actions that would obstruct another party’s access to evidence. This rule emphasizes the importance of fairness in legal proceedings and the integrity of the judicial process. Lawyers are required to facilitate rather than hinder the discovery process, which includes ensuring that all parties have reasonable access to relevant evidence. By obstructing a party's access to evidence, an attorney undermines the fairness of the legal process, potentially skewing the outcome of a case.

In contrast, presenting evidence with full disclosure is not only permissible but also a vital part of a lawyer's responsibilities. Lawyers must uphold principles of honesty and transparency when dealing with evidence. Requiring evidence to be notarized or arranging for evidence collection are also actions that do not violate this rule; they pertain to the gathering and verification of evidence rather than obstructing access to it. Thus, the correct focus of the rule is the prohibition against obstruction, making it clear that obstructive behavior in relation to evidence is unacceptable.