To get started look here: http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=61862
On your lingering disbelief of your suppliers truthfulness in the C of C: Periodic auditing of their truthfulness by your QA peeps or a third party is an accepted approach.
Other things that may help: * A Buzz Session on Supply Chain Issues at IPC APEX 2012 in San Diego that includes counterfeit parts * A group on LinkedIn that discusses counterfeit parts * CALCE counterfeit symposium http://www.slideshare.net/dandimase/Counterfeit-Part-Avoidance
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