We had a pitting problem on a standing order of beryllium flight hardware. The contracting company narrowed down the problem only affecting orders machined in the summer months. It finally got bad enough year after year the Department of Energy sent forensic investigators to our facility during the summer. The observed us cutting and eating our fresh homegrown tomatoes during lunch. Yep, tomato acids transferred from our hands to the parts.....We were busted after vehemently denying doing anything different during the machining processes.