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Sweitzer from purdue university. good morning. >> good morning. >> i'm curious about the radiation. we wanted to talk to you an expert here. when are they no longer going to be able to do the job? what exposure level might they get sick in the short-term? >> well, it's difficult to say, alex, because it's very dependent on where they go in the plapt and the radiation levels that are in the plant. and certainly they're well aware of those levels, those higher levels, and they try to avoid those areas, because if they do get elevated exposures that might cause the early symptoms of radiation sic...

Fish. all of this habitat has been fouled by oil. >> a lot don't know. it depends on the exposure level. >> reporter: the oil well is finally dead. but the debate over the oil spill's environmental impact is just now coming alive. ed lavandera, cnn, new orleans. >> ed, thanks so much. we're going to get more on this issue with somebody who's been there on the ground from the very beginning. deano bonano. he's the homeland security director for jefferson parish. he's going to be giving his take on whether he believes the assessments. my subaru saved my life. i won't ever forget that. love. it's...