Summary

Portrait of William Rehnquist William Rehnquist Whitmore v. Arkansas — Opinion of the Court

And in keeping with the ancient tradition of the doctrine, we conclude that one necessary condition for "next friend" standing in federal court is a showing by the proposed "next friend" that the real party in interest is unable to litigate his own cause due to mental incapacity, lack of access to court, or other similar disability.
That prerequisite for "next friend" standing is not satisfied where an evidentiary hearing shows that the defendant has given a knowing, intelligent, and voluntary waiver of his right to proceed, and his access to court is otherwise unimpeded.
Source: Wikisource

Portrait of William Rehnquist William Rehnquist Whitmore v. Arkansas — Opinion of the Court

As an alternative basis for standing to maintain this action, petitioner purports to proceed as "next friend of Ronald Gene Simmons." Although we have never discussed the concept of "next friend" standing at length, it has long been an accepted basis for jurisdiction in certain circumstances. Most frequently, "next friends" appear in court on behalf of detained prisoners who are unable, usually because of mental incompetence or inaccessibility, to seek relief themselves.
Source: Wikisource

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