I suspect that the problem isn’t that the poly piping will cause a house to ‘not pass a home inspection’ but rather that the home inspection will alert the buyer to the existence of the poly piping in the house.
A home inspection should not ‘pass’ or ‘fail’ a house, it should report what is wrong and most likely will also provide information on the existence of systems such as the poly piping.
Try this, if this link is working properly, click the link below for more information:
http://www.masterplumbers.com/plumbing/wwwboard/Forum1/HTML/001376.html This should open a new window (so you will also still be here) which you will need to close.
There is a lot of information there for you, just scroll down.
[Edited by Jerry Peck on 02 November 2000]