In the United States v. Moore et al., 1975, the Supreme Court ruled that physicians could be prosecuted under federal narcotics laws for excessively prescribing drugs without a legitimate medical purpose. The case involved Dr. James R. Moore who was convicted of distributing methadone outside of his professional practice and not in good faith, violating federal law regulating controlled substances distribution. His defense argued that he should have been immune from such prosecution because he was registered with the Attorney General to dispense these substances as part of his profession as a physician; however, this argument was rejected by both lower courts and ultimately by the Supreme Court too. The court held that registration only protected physicians acting within their professional capacity - it did not grant them blanket immunity from criminal charges related to drug dispensation or distribution violations. This ruling clarified doctors' responsibilities regarding prescription practices and established legal precedent for prosecuting those who abuse their position to illegally distribute controlled substances.

In the dissenting opinion for United States v. Moore et al., 1975, Justice William J. Brennan Jr., joined by Justices Thurgood Marshall and Potter Stewart, argued that the majority's decision to uphold a conviction based on evidence obtained through warrantless wiretapping was misguided. They contended that this ruling violated Fourth Amendment protections against unreasonable searches and seizures because it allowed law enforcement agencies to bypass obtaining warrants if they believed their actions were in line with national security interests. The dissenters expressed concern about potential abuses of power without judicial oversight or checks on executive authority, arguing that such unchecked surveillance could lead to violations of citizens' privacy rights under the guise of protecting national security.