I wonder if sandwich bags and other used plastic bags retain food debris (and spoiled food debris) which makes them a problem for grocery stores who try to keep the stores hygenic.

why can't I see the answer on these type of questions when you click ???

no

I like buttermilk chicken cripsy sandwhiches.

In my area, they can be recycled along with the plastic bags that I take to the grocery, but not in curbside collection!