"Any agency that is above the law [such as CIA] can get away with anything. It's sad, and most people don't know it, or care, but it's true,” the source says. “When they invoke national security, everyone just craps their pants, even judges."
RDocs via MuckRock show internal DEA training manuals instructing for parallel construction based on classified / illegally obtained information, combined with an internal review board to shield that information from the public courts."Americans don't like it!"
https://www.muckrock.com/news/archives/2014/feb/03/dea-parallel-construction-guides/