"Brain dead" is a medical fiction to justify the taking of human organs for profit. The victim has to be alive for any organs to be of use. This is how it works. The victim is injected with drugs that paralyzes. When the surgery begins, the victim feels every scalpel cut as their organs are removed. No pain drugs are ever given because the victim's body needs to release adrenochrome for preserving the organ tissue. It is the ultimate horror show.