There really is a case for all dna being taken, I know it infringes civil liberties but wow. What a monster.
The part that got me was that in the note he left he'd said that he had got control of his "impulses" and hadn't done anything since 97. Impulses... what a word for it.
Wonder why this guy was never caught?
https://www.theguardian.com/world/2021/oct/01/paris-serial-killer-of-80s-and-90s-was-ex-police-officer-dna-shows