If your home was constructed between 2001 to 2007 you could have Chinese drywall.  Mostly it has been found in homes constructed during the height of the housing boom and shortly after Hurricane Katrina 2004 to 2007. Materials were in short supply, Contractors and builders unknowingly used millions of pounds of abundant and cheap imported defective Chinese-made Drywall. Electrical wiring as well as other copper, silver and metal fixtures may exhibit sulfide corrosion when exposed to the reduced sulfur gases. Due to the electrical shock hazard presented by live wires, we recommend you hire a licensed professional to inspect electrical system components.