CVS Pharmacy must count on prescription drug sales to stay in business, but Wal-Mart doesn't need to add a massive markup to the medications they sell.  The local temperature with the medicine producing country is one as well as the other country might be another, along with the avian temperature is the other.  Most drugs need to get stored at exact temperatures, so one of the things pharmacists learn in pharmaceutical quality training will be the necessary steps to keep the facilities clean and in compliance with regulations.  
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