How Can I Tell If Meat Has Been Brined?
Empirically, you could use a salinity meter-- one that is made for checking salt water fish tanks. The only other thing I can think of that would drive seasoning into the meat would be cooking in a pressure cooker. I believe some grocery stores employ such a method on chicken before finishing in a rotisserie. Certain fried chicken chains also deep-fry in a pressure vessel which could yield similar results.