Thanks, MethGuy for the great discussion. I just want to clarify for you and anyone else reading this discussion that I do NOT sell test kits, test properties or clean up properties myself. I work for an organization that is making an effort (quite successfully, actually) to educate people on Meth to reduce use and raise awareness. Part of the awareness is for groups to learn how to deal with the results of Meth use as well (like Realtors/landlords) and it is in this context that I have looked into home testing kits.
When we educate people about the subject of testing properties, it is usually to help landlords prevent an issue (incorporating testing into the agreement between landlord and tenant, for example, can reduce the likelihood that a paranoid Meth user will want to occupy those certain properties) and/or to help a homeowner to deal with the results they may have if their tenant did contaminate the property through use or manufacture, or they purchased the home (with or without knowledge of the home's history). We have never suggested that they will be able to have a person arrested based on the results of the testing. Instead, we try to have it be forward-looking--in terms of what to do with the property or prevention as I have stated. Of course, some owners may take it upon themselves to try to go after the previous occupant in a lawsuit to get back the money they have to spend to clean it, but this is not something they get from us. They might also try to pursue an arrest through law enforcement, but I would guess that will be all but impossible and LE would probably not pursue any action based only on a positive test in a property, unless some of the evidence in the home also directly connected it to a certain person.
If you looked back at the previous links from my earlier posts, you may have seen a specific test kit from our website. We do not link to this from our main site anymore. Not quite sure if it is still an active page or not. For the past year or two, we have just encouraged people to do a lot of research, using the questions from our website and other information we can provide them so they know what they will be getting (and not getting as the case may be). And as you suggest, we do still use a lot of qualifiers on much of what we discuss in this area. There are just too many unknowns at this point to give any definitive information related to how much contamination is safe, how best to remove it, just what the health risks are from such exposures (after all, the levels used in most states are equivalent to an Equal packet dissolved in water and spread across an entire football field). I don't think anyone would argue that there is a point at which the level of Meth in a property becomes unsafe. The difficulty right now is in knowing what that point is (varies per individual also, i.e. asthmatics, young children, elderly who may be more vulnerable).