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Into that well. for weeks, we have been hearing that this will be the first of two final procedures to stop the leak. but today the feds told us there is actually a slim chance this alone could stop the leak once and for all. kris gutierrez is live at a seafood processor in slidell, louisiana ere folks are watching this very carefully. what do we know tonight, chris? >> hi, jon. the goal is to pump that heavy drilling mud at a rate strong enough to overcome the pressure of that oil. if it works, bp would then use that same system of pipe work to actually shoot cement into the leaking well to f...

Alternative whereas when you look at risk reward i'm not really sure what they are seeing the reward is from doing this -- the so-called static kill. >> let me ask you about the toxicity here. we heard some claims about the chemicals that's in this drilling mud and cement they are toxic to marine animals. especially of concern are the dispersants used since this oil started leaking. lisa myers, nbc investigative reporter reviewed some 400 study from 1997 showed 75% found that the combination of oil and dispersants increased the toxic effects of oil. how would you rate how the government and bp...

I'm don lemon. time for your headlines. americans are dealing with their new immigration law, a law that came with much consternation. the judge blocked the most controversial parts of it. governor jan brewer fought back but lost her bid to get a speedy appeal hearing. that is not going to happen until november. the gulf of mexico working to repair the crippled well has hit a snag. static kill won't begin until monday or tuesday. that's when heavy drilling mud and crement will be pumped into the cell from above to push the crude oil back down into the earth. but first sediment from the tropica...

>> reporter: thad allen tells us that his field commanders out in the field have always had the authority to decide whether or not to use the chemical dispersants or whether or not to tell bp not to use them. he says it was done on a case by case basis and the decision came down to do we allow the impact of the oil or ramp up dispersants and it appears they chose the latter. >> julie: what is going on at the site this afternoon? >> i want to show you brand-new video. we got new pictures and you can see the tanker that will pump the heavy drilling mud in well bore to help with the static kill. ...

Gallons into the gulf. here's why some say that's bad. listen. >> we know that the oil, the dispersant are both toxic. put them together, they're more toxic on things that are really critical to the marine biology in the gulf of mexico. >> now, incident commander thad allen says that it's approved on a case-by-case basis so his field commanders actually have the authority to decide whether or not to ramp up the use of chemical dispersants or allow that oil to make shoreline impact. apparently, they decided to use more oftentimes than not those chemical dispersants. >> what's going on now at th...