ZD,
But your comment presupposes that someone who speaks Yiddish is less likely to be certified. And the fact is that there are many hundreds with all the certification and qualifications. Including not just masters in special Ed but with additional specialty certifications and PhDs as well. And I am not referring to deconstructionist rabbis. I am talking chasidish men and women. With all the levush.
Just because some speaks English or Spanish does not make the person certified or qualified to be a teacher.