Which doctrine prevents illegally obtained evidence from being admitted at trial?

• A. Exclusionary Rule
• B. Plain View Search
• C. Inventory Search
• D. Stop and Frisk

Answer: (A)

The Exclusionary Rule prevents illegally obtained evidence from being admitted at trial. It upholds constitutional protections by barring evidence obtained through unreasonable searches and seizures, ensuring that police misconduct doesn’t go unpunished in court. This rule also aims to deter future violations; that deterrence effect is a big part of why it exists.

There are important nuances, such as exceptions where evidence found under questionable circumstances might still be used if, for example, it was obtained in good faith reliance on a defective warrant, was discovered through an independent source, or would have been discovered inevitably anyway. The idea that evidence tainted by illegality can still be used unless one of these narrow exceptions applies is part of the legal landscape you’ll encounter.

The other items describe different police practices rather than a rule about evidence admissibility. Plain View pertains to seizing items visible in plain sight during a lawful observation; Inventory Search covers procedures for cataloging belongings; Stop and Frisk relates to a brief detention and frisk based on reasonable suspicion. None of these address excluding evidence simply because it was obtained illegally, which is why the Exclusionary Rule is the correct doctrine.