I understand your desire to know about the possibility of a sinkhole developing on a lot. But I think it's important for you to know that sinkhole testing, while able to provide some insight to the possibility of a sinkhole in an area, will almost never be conclusive about the likelihood of one developing on a particular lot. Several reliable (imo) resources have referred to sinkhole prediction as being akin to weather prediction. You won't be 100% certain even with testing.
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