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Kathmandu, Nepal (CNN)On the streets of Kathmandu, the sight of people begging for kidney treatment has become common.
The capital of Nepal is no different from many places in the world where aging populations, poor diets and no health insurance systems mean increased organ disease.
The organ in highest demand is the kidney and black market traffickers are meeting that demand. Up to 7,000 kidneys are obtained illegally every year, according to a report by Global Financial Integrity.
Organ trafficking is an illegal, yet thriving trade around the globe.
That same report shows the illegal organ trade generates profits between $514 million to $1 billion a year.
In Kathmandu, we spotted a couple begging on the street for their son's kidney treatment.
Jeet Bahadur Magar and his wife spent their entire savings to treat their son's kidney disease.
Out of money and options, they are now out on the street hoping to raise enough funds to cover the medical bills.
"I pray to God that no one has to ever go through kidney failure problems," Jeet Bahadur said.
But many Nepalis do.
During our visit, Nepal Kidney Center in Kathmandu was packed with patients having dialysis -- a grueling four-hour process of purifying blood through a machine.
A patient can avoid the kidney transplant by having dialysis at least three times a week.
Those lucky enough to afford a transplant still face obstacles: the donor must match the blood group of the recipients and Nepali law requires the organ donor to be a family member.
Nepal's 'kidney bank'
We traveled to Kavre, a tiny district close to Kathmandu, and what activists and authorities say is a ground zero for the black market organ trade in Nepal.
Here, kidney trafficking rackets -- well organized and well funded -- dupe the poor and uneducated into giving away a piece of themselves.
The district has developed an unfortunate reputation as the "kidney bank of Nepal."
For more than 20 years, activists say, people from villages in Kavre have been the primary source of kidneys for sick and desperate patients throughout Nepal. But now the numbers are being tracked.
In the last five years more than 300 people have been reported to be victims of kidney traffickers in this district alone, according to Forum for Protection of People's Rights, a Kathmandu-based non-profit human rights organization. Some activists say the number is much higher.
"Social stigma and threats from traffickers keep many victims from coming forward," said Rajendra Ghimire, a human rights lawyer, and director of Forum for Protection of People's Rights.
'The meat will grow back'
Nawaraj Pariyar is one of the many victims of kidney traffickers.
Like many in Kavre, Pariyar makes a living from selling cattle milk and doing seasonal labor jobs on nearby farms. Poor and uneducated, all he has is two cows, a house and a tiny plot of land.
Pariyar used to visit Kathmandu to find construction work. He was on a site in 2000 when the foreman approached him with a dubious offer: if he let doctors cut out a "hunk of meat" from his body, he would be given 30 lakhs -- about $30,000.
What he wasn't told: the piece of "meat" was actually his kidney.
"The foreman told me that the meat will grow back," Pariyar said.
"Then I thought, 'If the meat will regrow again, and I get about $30,000, why not?'"
"What if I die?" Pariyar remembers asking the foreman.
The foreman assured Pariyar that nothing would happen. He was given good food and clothes, and was even taken to see a movie.
Then he was escorted to a hospital in Chennai, a southern state of India.
Traffickers assigned a fake name to Pariyar and told the hospital he was a relative of the recipient. The traffickers, Pariyar says, had all the fake documents ready to prove his false identity.
"At the hospital, the doctor asked me if the recipient was my sister. I was told by the traffickers to say yes. So I did," Pariyar said.
"I heard them repeatedly saying 'kidney'. But I had no idea what 'kidney' meant. I only knew Mirgaula (the Nepali term for kidney.)
"Since I didn't know the local language, I couldn't understand any conversation between the trafficker and the hospital staff."
Pariyar was discharged and sent home with about 20,000 Nepali rupees -- less than one percent of the agreed amount -- and a promise he would have the rest shortly.
He never received any more money and never found the trafficker.
"After I came back to Nepal, I had a doubt. So, I went to the doctor. That's when I found out I am missing a kidney," Pariyar said.
Pariyar is now sick and getting worse by the day. He has a urinary problem and constant severe back pain.
But he cannot afford a trip to the doctor and is afraid he will die.
"If I die I can only hope for the government to take care of my two children. I don't know if I will die today or tomorrow. I'm just counting my days," Pariyar said.
Pariyar's experience is one of many similar stories we heard in Kavre.
Understanding the economic situation in this district is the key to understanding why so many people here easily fall prey to kidney traffickers.
There are hardly any other economic opportunities other than substantial farming and rearing livestock. One bad harvest or a big medical bill can easily ruin families.
"The main reason is poverty and lack of awareness. It is very easy for the traffickers to brainwash the villagers. Also, the villages in Kavre are close to the capital and are easily accessible," Ghimire said.
Traffickers use proxies at different stages of the process. First, someone will approach the victim, another will create the donor's fake documents and then another will escort the donor to the hospital.
Few hospitals in Nepal perform kidney transplants. And even the doctors in Nepal know most well-heeled patients prefer to go across the border to India.
"They want better services, they want Indian doctors. That's why they go to the hospitals in India," said Dr. Rishi Kumar Kafle, Director of the National Kidney Center.
But activists have other explanations for the demand for Indian surgeries.
"It is hard to cross-check Nepali records across the border, so traffickers prefer to take the donors to India," Ghimire said.
We noted, before any kidney operation can be carried out in India, the hospital requires a No Objection Certificate, a letter drafted by the Nepali embassy in New Delhi confirming the donor as the kidney recipient's relative.
Photographs of the recipient and the relative, who would be the legitimate donor, were not included in the letter until recently.
Since Indian hospitals accept official Nepali documents, anyone could show up at the hospital, provide papers saying they were that person and have their kidney removed.
Activists say this is the loophole traffickers used for many years.
With the easy availability of forged documents, traffickers can beat the system.
While the Nepali government tries to tighten policies, Nepal's police officers are trying to crack down on the criminal rings.
Last year authorities arrested 10 people accused of organ trafficking in Kavre. Their case is still in court.
Sub-inspector Dipendra Chand, who led the police investigation, says stopping the underground trade is difficult.
"If we crackdown in one village, the traffickers simply move to another," Chand said.
Rajendra Ghimire says that the trafficking rings are now moving beyond Kavre.
"We have reports that this problem is expanding into other surrounding districts as well," Ghimire said.
The attention to this problem is growing in Kavre. Kidney trafficking stories are making headlines on the local and national newspapers.
But for victims like Pariyar and others, the media attention is too late.