Some schools require foreign students to pass an English speaking test before they are permitted to teach.

VOA: special.2009.01.29

"Sixty percent." "Can we extrapolate from that, if there's 90 or even 85 percent of the folks that are on this chart here, that have not been polygraphed that, maybe 60 percent of them might not pass the polygraph if they took the test?" "We and others have done that analysis,senator, and have reached the same conclusion."

VOA: standard.2010.03.11