I'm old enough to remember Ernest Saunders, Guinness scandal (financial misdeeds) Sentenced to 5 years, served 10 months and was released because he had Alzheimers Disease.
Not long afterwards he 'recovered' and is still around best part of 40 years later. Remarkable and I would imagine, unique.
We need to be very careful about the rich having recourse to different treatment and protections than the poor have.