The US shrimp industry seems to operate under the following theory _ if they do the same thing, over and over, the result will eventually be pleasantly rewarding. Twice since 2004, the industry has pressured trade officials to investigate the "dumping" of frozen shrimp from Thailand, the biggest supplier of shrimp to the US. Twice they were defeated. But the persistent protectionists are at it again, hoping once again for a different result and a better life financed by huge fines against Thailand.