Ooh, what's that smell? Has there been more than mac 'n' cheese cooking on your stove?
The problem with meth labs—in addition to their tendency to explode—is that they leave hazardous chemical residue in the home. Unsuspecting new tenants or homeowners may live in the house with contaminants in the walls, appliances, plumbing, etc. Common household chemicals used in meth recipes are methanol, ether, benzene, methylene chloride, trichloroethane and toluene. Exposure to benzene, for example, increases your risk of leukemia.
To find out if your home is a former methamphetamine lab, check the U.S. Drug Enforcement Administration's National Clandestine Laboratory Register. Labs are listed by state and county. Here's the PDF for North Carolina, and addresses in local counties are listed below.