Where milk is lurking ...

Hidden Sources of Milk

BEWARE! (From the food allergy network)
Deli meat slicers that are used for both meat and cheese products
Some brands of canned tuna fish contain casein, a milk protein
Many non-dairy products contain casein (a milk derivative), listed on the ingredient labels
Some meats (like hot dogs, etc.) may contain casein as a binder. Check all labels carefully.
Meats cooked in restaurants -- steaks, chicken, fish, etc. The reason they taste so good in a restaurant is because they are coated in butter. It may have melted by the time it was served to you, but it's there!