A more thorough explanation:

The inevitable discovery rule is a legal principle that allows evidence that would otherwise be inadmissible in court to be used if the prosecution can prove that the evidence would have been discovered legally and inevitably. This means that even if the evidence was obtained illegally, it can still be used if it would have been found anyway through legal means.

For example, if the police illegally searched a suspect's home and found drugs, the evidence would normally be inadmissible in court. However, if the prosecution can prove that the police were in the process of obtaining a warrant to search the suspect's home anyway, the evidence may be admissible under the inevitable discovery rule.

The most famous case involving the inevitable discovery rule is Nix v. Williams. In this case, the defendant made admissions about the location of his victim without the presence of a lawyer. The police eventually found the victim, and the defendant was found guilty of murder. The defendant argued that his admissions should be suppressed because they violated his Sixth Amendment right to counsel. However, the Supreme Court held that the inevitable discovery rule could be applied because the victim would have been found on the same day anyway, given that the exact location was only two and a half miles from where police were searching and in the direction that the search was approaching.

Overall, the inevitable discovery rule is a way for the prosecution to use evidence that would otherwise be inadmissible in court. However, it can only be used if the prosecution can prove that the evidence would have been discovered legally and inevitably.