Without being aware of it, Vernon Madison might become a footnote in constitutional law because he is barely aware of anything. For more than 30 years, Alabama, with a tenacity that deserves a better cause, has been trying to execute him for the crime he certainly committed, the 1985 murder of a police officer. Twice the state convicted him unconstitutionally (first excluding African-Americans from the jury, then insinuating inadmissible evidence into the record). In a third trial the judge, who during his time on the bench overrode more life sentences (six) than any other Alabama judge, disregarded the jury's recommended sentence of life imprisonment and imposed the death penalty.

The mills of justice grind especially slowly regarding capital punishment, which courts have enveloped in labyrinthine legal protocols. As the mills have ground on, life has ground Madison, 68, down to wreckage. After multiple serious strokes, he has vascular dementia, an irreversible and progressive degenerative disease. He also is legally blind, his speech is slurred, he has Type 2 diabetes and chronic hypertension, he cannot walk unassisted, he has dead brain tissue and urinary incontinence.

And he no longer remembers the crime that put him on death row for most of his adult life. This is why on Tuesday the Supreme Court will hear oral arguments about the constitutionality of executing him.