Fritz,
In a not to distant past life or career (however you want to look at it) I was HMFIC or supervised Meth Lab Clean Up and sampling. I can tell you stories of Meth Labs in hotel rooms, rental houses, apartments, Child Day Care Centers, warehouses, shacks, mobile labs in vans and SUVs, the list goes on and on.
Those producing this venom don't care about those who might be affected, only about making and selling it to support their own habits. Don't get me started on the effects I've seen on families and small kids or on retired folks that have two or three rental units to suppliment their retirement income that lose everything after a meth lab is discovered in or on their property. Yeah, it makes me mad.
Lots of ways to make meth to, ever seen a urine meth lab site? Not only is it a hazardous waste site, it's also a biological waste site. There are stupid people in this world, we all know that but, stupid mixed with this venom is worthy of a Darwin Award.