Genetically modified foods being imported into US?

[TheDormouse]

I bought some delicious grapes at the market the other day. The label says they were imported from Chile. What's particularly unusual about them is that they are HUGE. I've never seen grapes this large.

Now, it's obviously possible that these grapes just happen to be marvels of nature and eons of traditional agricultural know-how.

But they've got me wondering:
(1) How widespread is the use of genetic modification of crops in Latin America for fruit that is sold by American grocers? And how is that changing (ie, is the practice being adopted rapidly?)

(2) What requirements are there for imported genetically modified products to be labeled as being GMO? I would figure that there are zero, since even for products produced here, there are few laws mandating GMO labeling, thanks to the influence of Big Agra & their food industry partners.

[Hoyt]

1. Although I don't really care, if it doesn't say "no GMOs," I just assume it is.