In the 1994 case United States v. Juan Paul Robertson, the defendant was convicted of conspiracy to distribute cocaine and possession with intent to distribute cocaine. The Supreme Court had to determine whether a warrantless search of Robertson's car trunk violated his Fourth Amendment rights against unreasonable searches and seizures. The police had received an anonymous tip that Robertson would be transporting drugs in his vehicle on a specific day. They followed him, stopped him for speeding, obtained consent for a pat-down but not a full search, then brought in drug-sniffing dogs who alerted them to the presence of narcotics in the trunk. The court ruled that since there was reasonable suspicion based on detailed information from an informant corroborated by independent police work, it justified stopping and detaining Robertson until arrival of canine units without violating any constitutional protections under Terry v Ohio (1968). Furthermore, once dogs indicated presence of drugs inside locked trunk - this provided probable cause justifying its immediate warrantless search under automobile exception established by Carroll v United States (1925) as exigent circumstances existed due potential mobility inherent within vehicles which could result into evidence being lost or destroyed before obtaining warrants.

In the dissenting opinion for United States v. Juan Paul Robertson, the justice argued that the majority's decision to uphold Robertson's conviction under 18 U.S.C. § 924(c) was a misinterpretation of Congressional intent and an overreach of federal power. The justice contended that Congress intended this statute to apply only in cases where firearms were used or carried during crimes related directly to drug trafficking or violence, not white-collar offenses like fraud as in Robertson’s case. They believed that applying this law so broadly could lead to unjust outcomes and potentially violate defendants' rights against excessive punishment. Furthermore, they expressed concern about expanding federal jurisdiction into areas traditionally governed by state law without clear congressional authorization.