Which principle did the Supreme Court establish in US v. Leon regarding evidence obtained under a defective warrant?

Which principle did the Supreme Court establish in US v. Leon regarding evidence obtained under a defective warrant?

• A. The Exclusionary Rule always bars evidence regardless of police conduct
• B. Evidence obtained in good faith under a defective warrant may be admissible
• C. Warrants must be perfect to admit evidence
• D. The police may ignore the warrant if they believe it is flawed

Answer: (B)

The principle at work is the good faith exception to the Exclusionary Rule. In US v. Leon, the Court ruled that when police act with an objectively reasonable belief that they are following a valid warrant, the evidence they obtain can be admitted even if the warrant turns out to be defective. The idea is to deter police misconduct without letting honest mistakes by judges or officials bar reliable evidence. So, if officers rely in good faith on a warrant issued by a neutral magistrate and there’s no misconduct by the police (such as lying or deliberately ignoring facts), the resulting evidence is typically admissible. There are limits, though: the exception does not apply if the magistrate wholly abandoned his role or the warrant is so lacking in probable cause or so facially deficient that no reasonable officer would rely on it, or if the police themselves knowingly lied or recklessly misled the magistrate.

The principle at work is the good faith exception to the Exclusionary Rule. In US v. Leon, the Court ruled that when police act with an objectively reasonable belief that they are following a valid warrant, the evidence they obtain can be admitted even if the warrant turns out to be defective. The idea is to deter police misconduct without letting honest mistakes by judges or officials bar reliable evidence.

So, if officers rely in good faith on a warrant issued by a neutral magistrate and there’s no misconduct by the police (such as lying or deliberately ignoring facts), the resulting evidence is typically admissible. There are limits, though: the exception does not apply if the magistrate wholly abandoned his role or the warrant is so lacking in probable cause or so facially deficient that no reasonable officer would rely on it, or if the police themselves knowingly lied or recklessly misled the magistrate.