Fallout from an ongoing criminal case is turning into an ongoing headache for a number of players in the titanium supply chain.

An increasing number of companies are being queried by aerospace contractors about their possible former relationship with a San Diego distributor who has been charged with selling alleged "non-conforming" material. Several of those companies had assumed that concerns had been resolved in investigations that preceded an original indictment in December 2008.

But an "Agency Action Notice" circulated by the Corona, Calif.-based Government-Industry Data Exchange (Gidep) on Sept. 15 this year...