For information about how to test a house for meth - that has not legally been declared a meth lab - see Legally Declared Meth Lab and Undeclared Meth Lab.
If a property has been declared a meth lab by local authorities after
January 1, 2006, affidavits attached to the title of the property will describe the meth lab. For information about listed properties declared to be meth labs, see Legally Declared Meth Lab and Undeclared Meth Lab. If a property has not been declared a meth lab, the What is a Meth Lab page can be used to help determine a proper course of action.
If the seller knows there was a meth lab on the property, then yes the seller must disclose this fact before signing an agreement to sell or transfer the property. If the meth lab was not declared by local authority, the seller may not know or wish to disclose this information. See our What is a Meth Lab for information about what to look for in a property.
If the property has been declared a meth lab by a local authority, then it has to be cleaned up before it can be bought or sold. The Meth and Property Issues page has more information about real estate and meth issues.