[img_assist|nid=248|title=|desc=|link=none|align=left|width=100|height=43]The EFSA regularly states that volunteers from maize plants would not be a problem because the seeds wouldn't survive the winter etc. However even Monsanto found GM maize volunteers on their own test fields in Borken, in the North of Germany in 2007.
Cycling through the South of Hungary in September 2008, I found these single maize plants in the middle of a potato field.

[img_assist|nid=236|title=Maize volunteers|desc=|link=popup|align=right|width=200|height=117]