Reuters article from last Friday.

The restrictions imposed by our neighbor to the south were summarized in FIN 2010 - A007 and heavily referenced in FIN-2014-A005 The Reuters article is pretty thin; if you come across some that are more detailed, please link them here.

I do not see how this can be a positive development for U.S. banks with Mexican contacts.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.