If you were in fact exposed to asbestos, you should contact an attorney. However, as a practical matter, I suspect that it is incredibly unlikely that you were exposed to asbestos unless Walmart was retrofitting an aging building for use as a Walmart location. Most Walmart locations were built well after the use of Asbestos in insulation ended.
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Get yourself checked out by a doctor to determine if you have been exposed to asbestos, once that is determined then you can go about determining if you have a cause of action against walmart by looking for an asbestos litigation attorney in your area, best of luck.
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