March 08, 2012
On Thursday, March 8, 2012, the President signed into law:
H.R. 347, the "Federal Restricted Buildings and Grounds Improvement Act of 2011," which makes it a Federal crime to enter or remain knowingly in any restricted area of the White House, the Vice President's official residence, or their respective grounds without lawful authority.
Barack Obama, Statement by the Press Secretary on H.R. 347 Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/309809