Several people have contacted me asking how to tell if they have toxic Chinese drywall in their house or business. Generally, but not always, there is the "rotten egg" odor caused by Sulfur gasses. Also if there is some way you can view the back, or unfinished, side of the drywall see if it is marked as being made in China. Further if it is stamped "KNAUF" it is imported from China. Check your evaporator coils and copper wires in your indoor A/C units. If they are black you have the toxic drywall. Finally, remove the covers from some electrical outlets to see if the copper wires are black. Use care as the wires are live.
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