Actually wait a sec... Maybe I'm playing devils advocate here, BUUUUT, how do the reptile brands know what people used the land for before they got it? Considering all the chemicals (DDT, etc) that were used in the 60s, and how the reptile keeping hobby relly only kicked off in the 80s, and considering how long these chemicals can stay in the environment, and then the runnoff from other properties onto their soil sites, I guess there's really know way to know anywhere.

Again, I may be wrong, but I think these are valid questions.