Many articles have been written concerning BP's potential use of a version of Corexit (formulation EC9527A) that contains 2-butoxyethanol.
The conclusions in the articles run the gamut from realistic to the utterly ridiculous.
Attempting to finger BP for using a banned form of Corexit based on water analysis that contains 2-butoxyethanol is a legally problematic if not hopeless case because:
1) Samples of water from the same area would have to be tested for 2-butoxyethanol before the oil spill occurred to establish a baseline contamination level.
2) A baseline contamination level must be established because 2 butoxyethanol is used in paints and surface coatings, as well as cleaning products and inks. Other products that contain 2-butoxyethanol include acrylic resin formulations, asphalt release agents, firefighting foam, leather protectors, oil spill dispersants, bowling pin and lane degreaser, and photographic strip solutions. Other products containing 2-butoxyethanol as a primary ingredient include some whiteboard cleaners, liquid soaps, cosmetics, dry cleaning solutions, lacquers, varnishes, herbicides, latex paints, cleaning product, and glass cleaners.
3) Contamination of water by 2-butoxyethanol can come from a all too common human practice of dumping any and everything in lakes, creeks, ocean, and any other water, b) allowed levels of industrial and city waste water runoff, c) industrial pollution from any and all points north that has washed into the Gulf of Mexico from plants that dump waste legally and illegally into rivers that eventually feed into the Gulf.
The short and sweet of it is if BP used a banned version of Corexit you cannot prove it to a court or a jury.
Even the most fame seeking prosecutor could not get this case into any court let alone win it.
I have been a chemist for thirty-five years and have been on my share of hunts for chemicals that have escaped into the environment one way or another.
Proof is just not as simple as some journalists and politicians would have one believe as the BP Oil Spill saga grinds on to some far distant conclusion.