What is the exclusionary rule and the fruit of the poisonous tree doctrine?

• A. Derivative evidence tainted by illegal actions may be excluded.
• B. Evidence obtained unlawfully is inadmissible.
• C. Only physical evidence is subject to exclusion.
• D. The exclusionary rule never applies to statements.

Answer: (B)

The main idea being tested is that evidence gathered through violations of a person’s Fourth Amendment rights is not allowed in court, and that the chain of evidence can be halted at the point of illegality because the government cannot use what it illegally obtained. The best answer states that evidence obtained unlawfully is inadmissible, which is the broad rule known as the exclusionary rule. This rule protects the integrity of the investigative process by keeping illegally obtained material out of the courtroom.

The fruit of the poisonous tree doctrine is the natural extension of that rule: if the initial evidence was obtained illegally, other evidence derived from that illegality is usually also excluded. That means not only the direct evidence but any derivative leads that flowed from the illegal action are tainted and often excluded unless an exception applies (like independent source, inevitable discovery, or good-faith reliance on a faulty warrant). This nuance explains why one of the other statements—about derivative evidence sometimes being excluded—fits as a part of the doctrine, but on its own it doesn’t capture the full principle as clearly as the broad rule that unlawfully obtained evidence is inadmissible.

The remaining choices misstate the scope or applicability: the exclusionary rule applies to more than just physical evidence, it also covers statements obtained through illegal means in many circumstances, and the rule does not categorically exclude only physical items.