I'm a country girl from the Meth Belt. My money's on meth. Different steps of the manufacturing process have different smells. You can have samples taken from your home to have tested. I forget who to contact. I'll add more later.

Edit: Ok so if you Google meth residue test kit that's what you need. Also suggest cross posting over at r/homeimprovement and also agree with others saying to call the police or DEA tip line.