What does "fruit of the poisonous tree" refer to in legal terms?

The phrase "fruit of the poisonous tree" refers to a legal doctrine that signifies that evidence obtained through illegal means, such as unlawful searches or coercive interrogations, is not admissible in court. When the original source of evidence is tainted by illegality, any material derived from that source is also considered inadmissible. This principle aims to discourage law enforcement from violating constitutional rights and ensures that judicial proceedings rely on evidence that has been obtained lawfully.

Understanding this doctrine is essential in discussions surrounding the Fourth Amendment, which protects against unreasonable searches and seizures. By applying this legal concept, courts strive to uphold the integrity of the judicial system by excluding evidence that violates individuals' rights to fair treatment and due process. It promotes accountability for law enforcement agencies and encourages adherence to the rule of law.