Insurace Company cancels policy due to Celiac Diagnosis

I hope by now, everyone has heard of the practice of Rescission by health insurance companies.  They approve your coverage and accept your premium payments, only to later cancel your coverage when you get sick.  This is a horrible practice that must be stopped, in my opinion.  Here is a story of a young lady whose coverage was cancelled when she received a celiac diagnosis:

http://www.dailykos.com/storyonly/2009/9/20/784011/-A-Walking-Pre-Existing-Condition