<<Disclaimer: Verify this information before applying it to your situation.>>

I just checked the McDonald's website and found that they state the fries  
have wheat in them.  See below.
_http://nutrition.mcdonalds.com/nutritionexchange/nutrition_ingredients.html_ 
(http://nutrition.mcdonalds.com/nutritionexchange/nutrition_ingredients.html) 
 
    French Fries   French Fries:  
Potatoes, vegetable oil (canola  oil, hydrogenated soybean oil, natural beef 
flavor [wheat and milk  derivatives]*), citric acid (preservative), dextrose, 
sodium acid  pyrophosphate (maintain color), salt. Prepared in vegetable oil 
((may  contain one of the following: Canola oil, corn oil, soybean oil,  
hydrogenated soybean oil with TBHQ and citric acid added to preserve  freshness), 
dimethylpolysiloxane added as an antifoaming agent). *  
CONTAINS: WHEAT AND MILK (Natural beef flavor contains hydrolyzed  wheat and 
hydrolyzed milk as starting  ingredients).

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Visit the Celiac Web Page at Http://www.enabling.org/ia/celiac/index.html
Archives are at: Http://Listserv.icors.org/SCRIPTS/WA-ICORS.EXE?LIST=CELIAC