Research the year your home was built, or when it was renovated with new drywall. If you don't have the records, check with your local tax office or with your mortgage company who might have a list of previous owners through a title search. Call previous owners if possible. If the building or repairs was completed between 2001 and 2008, you may have Chinese drywall that contains sulfur.
Examine the unpainted back side of the Sheetrock. This is likely easiest in the attic, where you can easily pull up the insulation while wearing gloves. Check for a location notation, specifically "Made in China."
Photograph signs of corrosion in your home, such as on exposed copper pipes or the copper coils inside your air conditioning unit. The sulfur gas combines with the condensation on the outside of the pipes and coils and causes rapid corrosion, leading to cracked pipes or broken coils. Take the photos on a regular basis, such as once a week, to monitor the progress of the corrosion. Identifiable changes in the corrosion might be a sign that you have sulfur in your Sheetrock.
Keep a detailed log to monitor any health problems with the home's occupants. The Centers for Disease Control and Prevention reports the symptoms of short-term exposure to sulfur include itchy skin and eyes, difficulty breathing or other respiratory problems, and frequent headaches. Long-term effects include loss of appetite, forgetfulness and fatigue.
Contact an environmental testing agency to sample your Sheetrock for testing if you suspect sulfur in your drywall from a Chinese notation, corrosion issues or consistent health issues that could be sulfur-related.