In legal terms, which statement is correct regarding criminal cases?

In legal terms, the correct statement is that all evidence presented must be lawful. This principle is grounded in the rules of evidence, which stipulate that only evidence obtained through legal means can be admitted in court. This ensures that defendants receive a fair trial and that the judicial process maintains its integrity. Lawful evidence respects individuals' rights and safeguards against unlawful searches, seizures, and other violations, thereby upholding the overall fairness of the criminal justice system.

The other statements do not accurately reflect legal principles. Not all cases must go to trial; many are resolved through plea bargains or other means. The presumption of innocence is a fundamental principle in criminal law, meaning defendants are assumed innocent until proven guilty. Additionally, victims are often allowed to testify in criminal cases, and their testimony can be crucial for establishing facts related to the case.