Here's what it says:
"The foods on our list are not the only good foods on the market. Plus, we've named just one variety in each line by each maker. Usually, all the other varieties in a given line also meet our criteria."*
*pg 4 column 1 2/2006 Whole Dog Journal
The article is several pages and there is a lot of info. There is a sub-article titled "Yes, Dog Food Can Kill" which goes in to the causes of the mycotoxins (vomitoxin and Alfatoxin) which was found in the Diamond line. It also suggests that you should always keep the dog food bag around until it's empty so you have the date-code number handy if your dog gets sick from the food.
I do think this magazine is well worth subscribing to...they don't take any advertisements so they really do check all of the research without bias.