Funny story, I had a high % of a certain part that was causing rejects on the line. We traced the lot numbers with the manufacturer's help and...they had no information on the lot.

Now we had a big problem. Was counterfeit product getting into the mix? Our distributor claimed they were clean, the manufacturer claimed they were clean too.

Turns out that the manufacturer had temporarily moved production to a different plant during the Fukushima tsunami. There was some...confusion...during the move.