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In Shanghai, one student found her college English teacher, Daniel William Hiers, on a US list of the 15 most wanted criminals, according to Chinese state media CGTN and the Global Times.
The man had been profiled on America's most wanted list since March 2005 for murder and criminal sexual conduct.
Some people teach just 'to stay afloat' financially overseas
Indonesian law requires English teachers to have a masters degree and a minimum of five years teaching experience to teach in an international school.
But teachers who meet these requirements are becoming increasingly difficult to find as the demand to learn English increases.
Some schools have chosen to work around these requirements.
Yusuf Paudni, director general of tutoring from the Ministry of Education in Indonesia, said unqualified teachers could sometimes slip through the cracks.
"Many language courses employ native speakers, but some don't want to undergo the correct procedures or obtain a permit from the Ministry," he said.
"This is often due to the time to process and the cost factor."
However, he said it was not the Ministry's issue to resolve.
"It's actually the police's job to file a lawsuit against those kind of workers," he said.
Sydney-born Anya Filla-Dwehus (above), who has been teaching English in China for 18 years, said it could be hard for foreign nationals to work in the field they are qualified in due to strict Chinese Government regulations.
"While some are actual teachers back home, I've come across some people who are basically passing through and it's just something for them to stay afloat," she said.
There are conflicting reports on regulations around foreign teachers.
A Xinhua article published in July said it took at least four months to hire a foreign teacher by following the correct legal process.
Foreign teachers also need a bachelor's degree, two years of relevant work experience or a teaching qualification to obtain a work permit, the report said.
But Zhang Fucheng, vice-president of Yanshan University, told Xinhua in a separate article last September that there were currently no laws and regulations for foreign teachers in China.
"Legislation should be completed as soon as possible to improve the standards and methods for the appointment of foreign teachers, and their legal status, rights and obligations," Mr Zhang said.
Lynette Kim (far left), director of TESOL Australia, says many foreign schools want "the token white face"
English language skills seen as key to children's future
Learning English has been growing in importance in Asia over the last few decades.
International language company Education First (EF) revealed in their English Proficiency Index that Asia has the second highest non-native English speaking population, second only to Europe.
Many Asian parents see learning English as a key to a successful career.
The company's 2017 report — based on test data from more than 1 million participants — also found that adult English proficiency levels are directly correlated to the country's ranking in the United Nations Human Development Index, which measures the standard of living and economic growth among other achievements.
Economic development offered new incentives and resources to learn English, the report said.
Ms Filla-Dwehus said Asian parents saw learning English as a key pathway to a successful career.
In China parents want their children to be fluent in English, she said, and be able to pronounce words "just like a foreigner".
"[Parents] want to have that skill already developed before they get into secondary education."