The deans of 12 public health schools had complained about a reported vaccination program conducted by Dr Shakil Afridi who used a hepatitis immunisation survey in Abbottabad where bin Laden was later killed in a secret US mission.The CIA orchestrated the survey to try to obtain fluid containing DNA from relatives living near the bin Laden residence, the Washington Post reported . It said the effort failed and the surgeon, Afridi, was sentenced to 23 years in prison.Caitlin Hayden, spokesperson for the White House National Security Council, said Obama homeland security adviser Lisa Monaco had assured the deans in a letter that CIA policy as of August 2013 makes clear "the CIA will make no operational use of vaccination programs, which includes vaccination workers.""Similarly, the agency will not seek to obtain or exploit DNA or other genetic material acquired through such programs. This policy applies worldwide, and to US persons and non-US persons alike," she said.