An investigation? Why? This is not the first time this has happened. Screening tests for mad cow–tests that have a fairly high SENSITIVITY (so as not to miss cows that ARE infected) but a low SPECIFICITY (meaning a fairly high rate of false positives)–are used in the field, presently on sick-appearing cows only in The US as I understand it. When a cow tests positive, a confirmatory test with a higher specificity is done, but that takes a while (about a week I think–during which the meat is quarantined). This whole scenario went according to plan, and it will happen again.
Don’t get me wrong, I am glad that the USDA system worked. The system that I was commenting on was the fact that it looks like some insiders traded on some early info. The futures market works long term only if traders think that it is fair. I am not a trader.