Old woman has dementia. Family is tired of dealing with her. Heirs tell the doctor, "She always said she wanted to be put down if it came to this." There's no record of her having said this and no written record at all despite it supposed to be only by prior written consent.
They bring her in and tell her they are going to euthanize her. She becomes upset. They try to get her to drink poison. She refuses. She starts fighting everyone. She screams at the top of her lungs "I don't want to die!" and "I never said I wanted this! It's a lie!"
Doctor has the woman forcible held down. He then strangles her to death.
Initial inquiry said he was acting in good faith and cleared him of ethics violations. A second inquiry is questioning that and might find he violated ethics guidelines, which could result in a demerit against him and no penalty.
Inevitably this is what these laws lead to.