Three in 10 primary and middle school teachers say they have been secretly recorded by students during class.
The number is up from one in five in 2014, Ming Pao Daily reports, citing a survey by the Hong Kong Federation of Education Workers.
The survey interviewed 207 principal representatives and teachers across Hong Kong.
It found that the recordings were released publicly, according to 21 percent of the respondents.
Last year, 16 percent of interviewees made a similar claim.
Seven in 10 in the new survey are worried about the practice compared with three in five last year.
Wong Wai-shing, deputy chairman of the federation, cited three reasons for the recordings — for use during reviews, for fun and as evidence in any complaints.
That is consistent with the opinion of a quarter of the respondents who said secret video recordings have been used against them by students and parents, up from less than one in 10 last year.
Wong said the practice should not be ignored given the ease of storing information on mobile devices.
The federation said the practice will continue unless it is banned by the government or school boards.
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