A mentally incompetent person can enforce a contract when they are:

A mentally incompetent person can enforce a contract when they are adjudged competent by the courts. In legal terms, competency refers to an individual's ability to understand the nature and consequences of their actions, including the terms of a contract. When a court has evaluated the person's mental capacity and determined that they are competent, they regain the legal authority to enter into contracts, rendering those contracts enforceable.

Adjudication by a court provides a formal judgment validating the individual's ability to understand and agree to the conditions of a contract. This legal recognition is crucial, as it protects both the individual and the other party involved in the contract from possible disputes regarding the individual's mental state.

In contrast, simply having the consent of a parent or being under guardianship does not inherently grant the ability to enforce a contract, as those scenarios often imply a lack of competence. Being in public service does not affect one's ability to enter contracts regarding mental competency either, as it is unrelated to the legal status of their mental capacity.