A more thorough explanation:

The rule, the, is a legal procedure that excludes all witnesses from the courtroom while another witness is testifying. This is done to prevent witnesses from being influenced by the testimony of others and to ensure that each witness provides their own account of events.

During a trial, the judge may invoke "the rule" and order all witnesses to leave the courtroom before they testify. For example, if a witness hears another witness's testimony, they may change their own testimony to match what they heard, even if it is not accurate. By excluding witnesses, the court can ensure that each witness provides their own account of events.

Another example of "the rule" in action is during a police investigation. When officers are questioning witnesses, they may separate them to prevent them from hearing each other's testimony. This is done to ensure that each witness provides their own account of events without being influenced by others.

The rule, the, is a legal procedure that is used to ensure that witnesses provide their own account of events without being influenced by others. By excluding witnesses from the courtroom or separating them during an investigation, the court can ensure that each witness provides their own testimony based on their own observations and experiences. This helps to ensure that the court has accurate and reliable information to make a fair and just decision.