The 4th: Inevitable discovery
“The inevitable discovery doctrine, one exception to the exclusionary rule, states that if the prosecution can establish by a preponderance of the evidence that the information ultimately or inevitably would have been discovered by lawful means, the information is admissible despite the fact it was illegally obtained. Nix v. Williams, 467 U.S. 431, 444, 104 S.Ct. 2501, 81 L.Ed.2d 377 (1984). As explained by the Nix Court, ‘if the government can prove that the evidence would have been obtained inevitably and, therefore, would have been admitted regardless of any overreaching by the police, there is no rational basis to keep that evidence from the jury in order to ensure the fairness of the trial proceedings.’”
State v. Spears, 393 S.C. 466, 482 (Ct. App. 2011).