http://www.armorreport.com/
another story on the same subject.
In your link, we have
The vests in question were made by Custom Armor Technologies. That company is no longer in business. Diamondback Tactical supplied the vest, but the company has since moved out of the Valley.I'm going to guess that, as "Custom Technologies" went under increasing financial pressure, their final batches may not have been subjected to the best quality control. I would not be surprised to learn that, after their prototypes passed NIJ tests, they subcontracted actual manufacture to China.
The REAL culprit here, who will never be examined, is the police dept purchasing unit who bought "hundreds" of these vests, yet never thought to perform acceptance testing by taking one or two out of each purchased batch to the range for target practice.