I can think of a good reason. Proper termite treatment in our area requires drilling into the ground. I can see where this might create some problems with underground electric, gas, or water lines. As far as I know, we don't have this law yet, but it might be a good idea. Different areas have different treatment methods; some areas use the "tenting" method. I am not a termite expert, but I have seen the drilling and/or trenching done in my area.
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Comments made are my opinion, and not intended to be legal advice of any kind.