Answer:
Adversarial System.
Explanation:
An adversarial system or adversary system is the legal procedure under which the parties present their cases before a judge or jury. The advocates of the two parties gather information, pieces of evidence, witnesses, etc that are to be present before the judge. The case is present before a person or a group of people who would be impartial and after seeing the evidences pass the judgment which they find to be true.
So, according to the definition provided and the statement given in the question the answer is adversarial system or adversary system.
