"There is no control of the law," he said. "In Belgium patients are killed by euthanasia at the first diagnosis of Alzheimer's or of malignant disease of a cancer."
Anti-euthanasia activist Lionel Roosemont said in the "Safeguards" video that once euthanasia becomes enshrined in law, it soon ceases to be a free choice.
"The freedom of choice of euthanasia has become the obligation of choice, of having euthanasia," he said.
Once euthanasia is an option, sick people often feel they have an obligation to request euthanasia so as not to be a burden on their friends and family, Reitsema said.
"This shows you that by opening the possibility of euthanasia, you open a sense of burden," he said.
"Before it's a legal option, caring for somebody who needs care is just the human thing to do, but once they have the opportunity to choose to let their lives be ended, their not doing so is to choose to burden their next of kin. That's unfair."
Etienne Montero, a Belgian lawyer and Dean of Faculty of Law at the University of Namur, said euthanasia laws are also dangerous because of the unclear terms.
"The law says the patient must be suffering from a grave or incurable illness that results in physical or mental suffering, but it is evident that it would be questioned very quickly why someone who is suffering from a psychiatric illness should not also be able to access euthanasia. This is what we see today, we see that euthanasia applies in situations of psychiatric suffering that are not necessarily grave or incurable illnesses," he said.
In 2015, a 24-year old woman identified as Laura was granted the "right to die" under Belgium's law for suffering suicidal thoughts. But as the appointment for lethal injection neared, she changed her mind.
Belgium has also seen the law stretched beyond its original limits. While the original law only allowed those 18 years of age or older to request euthanasia, children of any age can now request euthanasia and be given it, if it is approved by doctors, psychologists, and their parents.
Marnix Coelmont, a teacher and advocate, said his advice to Canada would be that if they are going to approve euthanasia, then they also need to invest a lot of money in palliative, end-of-life care that so that people don't feel like they have to choose euthanasia.
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"Because unbearable pain is a very relative concept," he said.
Dr. Beuselinck said doctors can help their patients at the time of death without killing them.
"We help people to die by controlling their suffering and controlling their symptoms. We don't help them to die by killing them directly."