Yep, lots of flight training. I've only heard of one, but I live in
NorCal so I only hear what I see on the news. They showed an Army helo
follow the guy home. When approaced the pilot said he didn't realize he
entered Mexican airspace.

Actually, to be 100% correct, no one, no where cares if you enter
Mexican airspace. They want you to file a filght plan but there is no
procedure in place for the Mexicans to track, watch, or anything flight
plans. When you get trouble is when you cross back into the U.S.
without proper notice!!

-Robert