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I believe the answer is: If the attorney knows defendant is going to give false testimony

According to 
 Rule 3.3 of the Model Rules of Professional Responsibility, the American Bar Association ,  the attorney of the defendant wouldn't be legally liable to break confidentiality if the attorney for a fact that the defendant' testimonies are false.

A defense attorney, often known as a defense lawyer, is a lawyer who represents a defendant in litigation or criminal prosecution.

What did the defense attorney do?

A criminal defense attorney is in charge of putting together a strong defense and devising a winning strategy for their clients. He must prepare, file, and argue on behalf of the accused as their advocate and drafter. A lawyer's job description includes negotiating a plea bargain with the prosecution.

According to Rule 3.3 of the American Bar Association's Model Rules of Professional Responsibility, the defendant's counsel is not legally obligated to break confidentiality if the attorney knows for a fact that the defendant's testimonies are false.

For more information about defense attorneys refer to the link:

https://brainly.com/question/17026842