Question: Kevin, an attorney, has been indicted for embezzlement. After his preliminary hearing, he filed a motion to suppress a confession he believes was illegally obtained. A hearing was conducted and the trial court granted his motion. The evidence was vital to the prosecution. Kevin's attorney has also requested that the trial be continued because he claims that Kevin is not competent to stand trial. The judge ordered a mental evaluation, held a hearing, and found Kevin competent to stand trial. The defense also requested that the court order a number of police officers to submit to depositions prior to trial. The court denied the motion. At trial, the defendant objected to the introduction of a document that he believed was unconstitutionally obtained during a search of his office. The judge overruled the objection and admitted the confession into evidence. Answer the following questions using these facts.

Kevin appealed the trial court's decision denying his motion to suppress the document. The appellate court affirmed the trial court, and Kevin filed a habeas corpus petition in federal court claiming that his federal constitutional rights were violated by admission of the evidence. What should be the outcome?