BP said administration of the 2012 settlement was marred by the fact that people without actual damages could file a claim. The court ruled that BP hadn't explained "how this court or the district court should identify or even discern the existence of 'claimants that have suffered no cognizable injury. In 2012, tar balls continued to wash up along the Gulf coast [219] [220] [221] [222] and in 2013, tar balls could still be found in on the Mississippi and Louisiana coasts, along with oil sheens in marshes and signs of severe erosion of coastal islands, brought about by the death of trees and marsh grass from exposure to the oil. In late 2012, a study from Georgia Tech and Universidad Autonoma de Aguascalientes in Environmental Pollution journal reported that Corexit used during the BP oil spill had increased the toxicity of the oil by 52 times. Toxicity and Mutagenicity of Gulf of Mexico Waters During and After the Deepwater Horizon Oil Spill".

In the first birthing season for dolphins after the spill, dead baby dolphins washed up along Mississippi and Alabama shorelines at about 10 times the normal number. The FAA acknowledged that media access was limited to hired planes or helicopters, but was arranged through the Coast Guard.

S. Coast Guard stopped Jean-Michel Cousteau's boat and allowed it to proceed only after the Coast Guard was assured that no journalists were on board. The report also states that a central cause of the blowout was failure of a cement barrier allowing hydrocarbons to flow up the wellbore, through the riser and onto the rig, resulting in the blowout. In April 2012, oil was still found along as much as 200 mi (320 km) of Louisiana coastline and tar balls continued to wash up on the barrier islands. He performed it a number of times on the show with different guest singers, including Eddie Vedder, [415] Russell Crowe, [416] Brad Paisley, [417] and Florence Welch.

Transocean, however, blamed BP for making the decisions before the actual explosion occurred and government officials for permitting those decisions. On 20 May, BP determined that none of the alternative products met all three criteria of availability, non-toxicity and effectiveness. His ruling stated that BP "employees took risks that led to the largest environmental disaster in U. Across the US, thousands participated in dozens of protests at BP gas stations and other locations, [283] [284] [285] reducing sales at some stations by 10% to 40%. A finding of gross negligence would result in a four-fold increase in the fines BP would have to pay for violating the federal Clean Water Act, and leave the company liable for punitive damages for private claims.In some cases photographers were granted access only with BP officials escorting them on BP-contracted boats and aircraft. It was first thought that oil had not reached as far as Tampa Bay, Florida; however, a study done in 2013 found that one of the plumes of dispersant-treated oil had reached a shelf 80 mi (130 km) off the Tampa Bay region.

citation needed] Other studies have reported a variety of mental health issues, skin problems, breathing issues, coughing, and headaches. The manual adds: "Excessive exposure may cause central nervous system effects, nausea, vomiting, anesthetic or narcotic effects". Barbier ruled that BP had acted with "conscious disregard of known risks" and rejected BP's assertion that other parties were equally responsible for the oil spill. A report from the University of Florida said that many locations showed 20% of fish with lesions, while later estimates reached 50%.On 16 September 2010, the relief well reached its destination and pumping of cement to seal the well began. Another peer-reviewed study, released in March 2014 and conducted by 17 scientists from the United States and Australia and published in the Proceedings of the National Academy of Sciences, found that tuna and amberjack that were exposed to oil from the spill developed deformities of the heart and other organs that would be expected to be fatal or at least life-shortening. A 2015 study of the relative toxicity of oil and dispersants to coral also found that the dispersants were more toxic than the oil.

The two formulations are neither the least toxic, nor the most effective, among EPA's approved dispersants, but BP said it chose to use Corexit because it was available the week of the rig explosion. Another possibility is that it is formation oil escaping from the subsurface, using the Macondo well casing as flow conduit, possibly intersecting a naturally occurring fault, and then following that to escape at the surface some distance from the wellhead.S. Fifth Circuit Court of Appeals rejected an effort by BP to curb payment of what it described as "fictitious" and "absurd" claims to a settlement fund for businesses and persons affected by the oil spill. A 2015 study by the National Oceanic and Atmospheric Administration, published in PLOS ONE, links the sharp increase in dolphin deaths to the Deepwater Horizon oil spill. We always think about our face skin but neglect our body skin, and dry skin can be a common result of that," Dr.