I can't have wheat/gluten. You pretty much have to be a cook and be aware of ingredients of most dishes. If I'm not sure, I ask or skip it altogether. When attending potlucks with dietary restrictions, the rule is to eat beforehand and eat some of your own dish before it becomes cross contaminated.

And yes--the best pie crusts are made from lard. I remember making pie crusts that way as a child. It's white (not dyed yellow like margarine) and may actually be healthier that man-made substitutes--depending on your health stance.