In the 1990s, Saskatchewan physician John Schneeberger was exposed as a predator who used his medical expertise to commit and conceal sexual assaults. Accused of drugging and raping one of his patients, he initially evaded justice when DNA tests appeared to clear him—later revealed to be the result of him surgically implanting a tube of another man’s blood in his arm to fool investigators. After years of persistence by his victim and renewed police efforts, Schneeberger was finally convicted in 1999 of sexual assault, administering a noxious substance, and obstruction of justice. His case remains a chilling example of calculated deception, abuse of trust, and the resilience required to bring a serial offender to account.