I have been through the process as a homeowner.  If I would have known then what I now know, I would have hired a testor who was independent of the remediation company.  It is clearly a conflict of interests.

I would also like to note that 4 of the comments in this forum supporting the allowance of one company to take on both roles are from people connected to the same company, which happens to be the company that I dealt with.  I feel like this is a method of "stuffing the ballot box", giving the impression that four companies have this view, when it is in fact, one company (or affiliated companies.) 

Seperating these two roles is clearly advocated by the IICRC.