WASHINGTON (AP) — A top White House official has pledged that the CIA will no longer use vaccination programs as cover for spying operations. The agency used the ruse in targeting Osama bin Laden before the U.S. raid that killed him in 2011.

Lisa Monaco, President Barack Obama’s top counterterrorism adviser, wrote to the deans of 13 prominent public health schools last week, saying the CIA has agreed it would no longer use vaccination programs or workers for intelligence purposes. The agency also agreed to not use genetic materials obtained through such programs.