A study of Hmong refugees in Thailand found them "at the upper limits of human reproductive capacity."
The government then allowed its re-occupation by Hmong refugees from Laos for a few years in the early 1980s.
At the same time, Thailand has made clear its unwillingness to assimilate Hmong refugees.
However, the arrival of Hmong refugees did not immediately spark hatred and hostility.
However, despite the best efforts of the church and good Samaritans, the Hmong refugees have come to experience hate from the locals.
It is not knwn whether any other state is investigating similar charges against Hmong refugees.
Most of the population are Hmong refugees now settled in French Guiana.
But behind her infectious smile and dancing black eyes, this little Hmong refugee has horrible memories of the jungles of Laos.
More than 13,000 Hmong refugees live in Minnesota, including 2,000 who arrived this year, and perhaps an equal number are in Wisconsin.
Sudden unexplained death syndrome was first noted in 1977 among Hmong refugees in the US.