@Markus *******
Chiang Mai Immigration has made it pretty clear to us in the past, it's also quite a well known fact amongst school owners/managers. We've successfully processed several hundred ED visas and DTVs over the last few years, both with Chiang Mai Immigration, and with several Thai embassies around the world, so quite a lot of experience to draw from. I appreciate you may have been given a piece of information, but this is something my school works with on a daily basis.