Did mine a couple of years ago after reading an article about the potential for lead in soils in residential areas.
Thankfully my yard is fine, only the drip line of the house shows elevated lead (probably was originally painted with lead paint). So we just won't put food plants in the beds next to the house.
Slice and dehydrated some!
Dehydrated mushies can be kept (long shelf life) to add to meals. Or put them through a food processor to make a powder (takes up much less space, if that's an issue for you) which is great for extra flavour in soups, sauces, casseroles, etc.