Final answer:
Steve's attorney must prove that the police violated the 4th Amendment.
Step-by-step explanation:
Steve's attorney must prove to the Federal Court of Appeals that the police violated the 4th Amendment. The 4th Amendment protects individuals from unreasonable searches and seizures. In order for a search to be constitutional, the police need either a warrant or probable cause. Since Steve's car was searched without a warrant or probable cause, his attorney can argue that his constitutional rights were violated.
By presenting this argument to the Federal Court of Appeals, Steve's attorney can request for the evidence found in the search to be suppressed. If the court finds that the police did indeed violate the 4th Amendment, they will exclude the evidence from the trial, which can potentially lead to the reversal of Steve's guilty verdict.
Learn more about the 4th Amendment