In which case was evidence obtained without a warrant deemed inadmissible in federal court?

• A. Wolfe v. Colorado
• B. Weeks v. US
• C. Mapp v. Ohio
• D. Gideon v. Wainwright

Answer: (B)

In Weeks v. US, the court established a crucial precedent regarding the admissibility of evidence in federal courts. This case was significant because it marked the first time the Supreme Court ruled that evidence obtained in violation of the Fourth Amendment, which protects against unreasonable searches and seizures, must be excluded from federal prosecutions. The decision reinforced the principle that law enforcement must obtain a warrant based on probable cause before conducting searches, thereby protecting individuals' rights against invasive government actions.

The ruling in Weeks v. US laid the foundation for the exclusionary rule, which is the legal doctrine that prevents the use of illegally obtained evidence in court. This case directly contributed to the development of constitutional protections regarding search and seizure practices in federal jurisprudence. The importance of this ruling continues to influence criminal procedure and the standards for evidence in federal courts today.