Critics, on the other hand, believe that the rule does not uphold the best interests of the donors and that the rule does not effectively promote organ donation. Signs
Signs of death or strong indications that a warm-blooded animal is no longer alive are:

Respiratory arrest (no breathing)
Cardiac arrest (no pulse)
Brain death (no neuronal activity)The stages that follow after death are:

Pallor mortis, paleness which happens in 15–120 minutes after death
Algor mortis, the reduction in body temperature following death. This is generally a steady decline until matching ambient temperature
Rigor mortis, the limbs of the corpse become stiff (Latin rigor) and difficult to move or manipulate
Livor mortis, a settling of the blood in the lower (dependent) portion of the body
Putrefaction, the beginning signs of decomposition
Decomposition, the reduction into simpler forms of matter, accompanied by a strong, unpleasant odor. Skeletonization, the end of decomposition, where all soft tissues have decomposed, leaving only the skeleton. Fossilization, the natural preservation of the skeletal remains formed over a very long period

Legal
The death of a person has legal consequences that may vary between different jurisdictions. A death certificate is issued in most jurisdictions, either by a doctor, or by an administrative office upon presentation of a doctors declaration of death. Misdiagnosed
There are many anecdotal references to people being declared dead by physicians and then "coming back to life", sometimes days later in their own coffin, or when embalming procedures are about to begin.
Death is the irreversible cessation of all biological functions that sustain an organism. For organisms with a brain, death can also be defined as the irreversible cessation of functioning of the whole brain, including brainstem, and brain death is sometimes used as a legal definition of death. The remains of a former organism normally begin to decompose shortly after death. Death is an inevitable process that eventually occurs in almost all organisms. Death is generally applied to whole organisms; the similar process seen in individual components of an organism, such as cells or tissues, is necrosis. Something that is not considered an organism, such as a virus, can be physically destroyed but is not said to die. As of the early 21st century, over 150,000 humans die each day, with ageing being by far the most common cause of death.Many cultures and religions have the idea of an afterlife, and also may hold the idea of judgement of good and bad deeds in ones life (heaven, hell, karma). Diagnosis
Problems of definition
The concept of death is a key to human understanding of the phenomenon. There are many scientific approaches and various interpretations of the concept. Additionally, the advent of life-sustaining therapy and the numerous criteria for defining death from both a medical and legal standpoint, have made it difficult to create a single unifying definition. One of the challenges in defining death is in distinguishing it from life. As a point in time, death would seem to refer to the moment at which life ends.