Final answer:
The rule called the exclusionary rule prevents evidence obtained through illegal searches and seizures from being used in court proceedings, based on the Fourth Amendment.
Step-by-step explanation:
The rule that prevents illegally seized evidence from being introduced in court is known as the exclusionary rule. This rule, established by the Supreme Court in cases such as Mapp v. Ohio and Weeks v.
United States, dictates that evidence obtained in violation of the Fourth Amendment, which prohibits unreasonable searches and seizures, cannot be used in court proceedings.
This includes not only directly seized evidence but also any subsequent findings resulting from the initial illegal search, a doctrine referred to as the fruit of the poisonous tree. Exceptions to the exclusionary rule include situations where police acted in good faith, believing their warrant was valid, or where evidence would have inevitably been discovered regardless of the violation.