In the case of Cardwell et al. v. Taylor (1982), the U.S Supreme Court was tasked with determining whether a state court's decision to uphold an individual's conviction, despite evidence that their attorney had a conflict of interest, violated the defendant’s Sixth Amendment right to effective assistance of counsel. The petitioner, Taylor, argued that his lawyer represented both him and another co-defendant in a robbery trial which created conflicting interests for the attorney. However, he did not object at trial or on appeal about this issue but raised it during post-conviction proceedings. The Supreme Court held that there was no violation as long as it could be shown that any potential conflict did not adversely affect his lawyer's performance during trial or on appeal. It further stated that in order to demonstrate such adverse effect from dual representation by an attorney at trial level, one must show actual prejudice resulting from said representation rather than just possibility thereof.

The dissenting opinion in the case of Cardwell v. Taylor argued that the majority's decision to uphold a warrantless search and seizure was inconsistent with Fourth Amendment protections against unreasonable searches and seizures. The dissenters contended that there were no exigent circumstances justifying an exception to the requirement for a search warrant, as the vehicle involved was not immediately mobile nor did it present any danger. They also disagreed with the majority's view that because automobiles are inherently mobile, this somehow lessens an individual’s expectation of privacy within them. Furthermore, they criticized how broad implications could be drawn from this ruling; if police can seize vehicles without warrants based on probable cause alone, then other personal property might similarly be at risk. This would significantly weaken Fourth Amendment protections overall.