I rent a house with my wife and 1 year old son. The former owners of the house smoked a lot. Before we moved in, my wife and I wiped the walls down with cleaning solution and they just dripped black water when we sprayed the cleaning solution on them. It took a long time to clean them but the smell is MUCH better now. Anyway, my mother called me today and asked me if I had ever thought that this house was a former meth lab because of the smell. From what I have read, the smell in a former meth lab is very chemical. We’ve never smelled anything other than just stale smoke in this house. My mother covertly swabbed some dust from the cracks of the house and tested it with some meth tester. It didn’t register positive but eventually did a few days later. We really doubt that it was a meth lab but we don’t know what it would smell like. Is there a way to determine for sure? I’m afraid the landlords may just lie if we ask. Would the police department test the house for free?