It would be very difficult to determine if Chinese Drywall was used without removing the existing walls to see. However, as you stated, being in a dry climate area there most likely would not be the same problems, as in more humid and moist climate areas, with plumbing fixtures, pipes, exterior walls, and appliances getting corrosion from sulfer contaminents since the product was concentrated mostly in the Southeast. The concern about Chinese Drywall and its use has been around for quite some time so the article is not saying anything new.