Harel Hershtik has his electronic monitoring device for convicted and released prisoners on his left leg as he works in his labs in Rehovot, central Israel, Wednesday, May 11, 2022. When he was 20 years old, Hershtik planned and executed a murder. Today, he is the brains behind an Israeli health-tech startup, poised to make millions of dollars with the backing of prominent public figures and deep-pocketed investors.