>>We have a policy where  I
>>or my husband check the burger for cheese before my son gets it. 

This approach worked well for us for years until last August when there was 
enough milk protein from handling cheese on the gloves to transfer the 
protein to my son's food.  Just letting you know.  

I also wash the grocery store conveyor belt and have the cashier wash the 
other end of the register area before I put my groceries up to be checked 
out.  In the winter isn't too bad but you would be amazed at the amount of 
milk and melted ice cream on those belts in the summer.  The cashiers know me 
now and its not a problem.  We have not experienced a reaction from foods 
exposed to milk proteins this way, but we know of another family where it 
happened and that is when I started cleaning the belt.

E.J.