Question

Marissa is a potential witness in a criminal case. The defense counsel seeks to disqualify her as a witness based on Section 22 of the Rules of Court, which states that a person convicted of a crime involving moral turpitude is disqualified from being a witness. Marissa was previously convicted of estafa, a crime involving moral turpitude.

On the other hand, the prosecution argues that Marissa is qualified to testify under Section 21 of the Rules of Court, which provides that a conviction shall not disqualify a witness from testifying unless the court determines that his credibility has been impaired.

Based on the given facts and applicable laws, discuss whether Marissa is qualified or disqualified as a witness and explain the basis for your conclusion.