Here's a good link to check ingredients for each cookie and each manufacturer.
http://www.girlscouts.org/program/gs_cookies/meet_the_cookies.asp (http://www.girlscouts.org/program/gs_cookies/meet_the_cookies.asp)
I forget which one labels for shared equipment--ABC or Little Brownie.
One of them is offering GF cookies this year. But there is a company that I never heard of certifying they are gluten free even though they are made in the same facility and shared lines. Yeah, I will pass.
And I know that post sounded bitter - I did order 5 boxes for the troops overseas.