Note to Secret Service and Dept of Justice regarding cocaine in restricted area of White House: If you know of a felony, but do not report it, you are guilty of misprision of a felony, which is itself a felony. (Spelling is correct.)

“Whoever, having knowledge of the actual commission of a felony cognizable by a court of the United States, conceals and does not as soon as possible make known the same to some judge or other person in civil or military authority under the United States, shall be fined under this title or imprisoned not more than three years, or both.”
https://www.law.cornell.edu/uscode/text/18/4