A lethal drug promoted by euthanasia campaigners as a peaceful way to die is easily being illegally imported into Australia.
Known as the "peaceful pill", barbiturate nembutal, is promoted by the euthanasia movement as the best and most peaceful way to end your life.
Most have bought the illicit drug online from China, a country that in the last two years has come to dominate the market. The drug kills within an hour of being consumed.
"There are very few lethal drugs and the best lethal drug is nembutal," euthanasia advocate Dr Philip Nitschke told a recent workshop.
"I've been with a lot of people who have died using this drug, it just seemed to get into to a deeper and deeper sleep and then finally stop breathing.
"And for those watching they see this as the most peaceful of deaths, it certainly looks to be.
"Be careful, because it's illegal."
The penalty for importing or possessing nembutal is a prison sentence or a fine of up to $825,000.
Dr Nitschke says hundreds of Australians have illegally brought the drug into the country over the past couple of years.
The Australian Federal police have told ABC's Lateline program that since 2007 they have seized almost 15 kilograms of the drug.
But so far, no one has been convicted.
Mexico used to dominate the market but now most nembutal is bought over the internet from China.
Increasingly, there are reports of internet scams and Lateline has spoken to several people who have lost hundreds of dollars trying to buy nembutal online.
Arriving in flat packed envelopes, Chinese nembutal comes in the form of a white powder, and Dr Nitschke says people are worried about its quality.
"People obtain this white powder in envelopes from China and they're concerned in a way that I never saw, the same concern with the South American product," he said.
"They worry that maybe there's someone selling them something that is contaminated or not pure or maybe cheating them completely and selling them castor sugar or something."
To combat concerns, Dr Nitschke has set up a mobile testing laboratory, and he says, there is a long queue of people across Australia waiting to use it.
"I think we can say the vast majority, all except one, have shown to be exactly what they've purported to be, so in other words high quality nembutal," he said.
Dr Nitschke has tested the nembutal which terminal cancer patient David illegally imported earlier this year.
David says the drug was easy to obtain online and he was not fearful of any legal consequences.
"At 81 years of age, I don't think that crossed my mind. If they want to jail me, well I think that would be a very stupid action," he said.
"I sent an email requesting a sample, I received a reply asking me to forward $US360 and I duly arranged that, and two weeks later, my package arrived through the mail."
David says knowing he now has a choice is a comfort.
"Euthanasia goes against what most of us believe in, but you've got to say 'okay, there are other people there, who have a problem, so why not give them the right to decide'," he said.
"Sorry, I want out of here."
David bought his nembutal from a supplier listed in Dr Nitschke's book The Peaceful Pill Handbook.
The book is also banned in Australia, but for $80 you can buy online access to the publication. Dr Nitchske's group also produces instructional videos for those considering euthanasia.
In one tragic case, a young Sydney woman who was not terminally ill, but suffering from depression, accessed this information. She also attempted to buy nembutal online, but lost her money.
In May, the 30-year-old committed suicide.
Her family told Lateline: "The internet is a tool and has many good uses, but when vulnerable people can so easily get hold of information and videos that can do a great deal of harm, it can be devastating."
However, Dr Nitschke defended this advocacy saying the dissemination of euthanasia material information should not be banned simply because it is used for purposes other than those he intended.
"It's an age old question about censorship," he said.
"I can't guarantee where the information is going to, but I don't think that's a good reason for stopping giving out information."
But chair of the Federal Government's advisory council on suicide prevention, Professor Ian Webster, disagrees.
"I don't think that's an acceptable risk," he said.
"I mean there's a very fundamental principle in medicine, primum non serum, a Latin statement for 'above all do no harm', so no action that a physician or a surgeon or a doctor should take, should increase the likelihood of harm.
"It's a very difficult balance to strike. Overwhelmingly I put my weight on preventing suicide and against promoting suicide methods to elements of the population which are at high risk."
Dr Nitschke is currently facing two investigations by the Australian Health Practitioner Regulation Agency over claims he is not a fit and proper person to hold medical registration but he says losing his licence will not stop his work.
"Well, in a practical sense it would make very little difference," he said.
"Because of the growing demand if you like, of a growing or increasing number of elderly people who are demanding control over the end of their own life."