Once you have enabled AI Servo mode and selected the correct focus points (if you want to adjust them from how the camera is currently set up), the only control you need is the shutter button -- just pressing this halfway will enable focus tracking on the focus points that are enabled.
The Social Security Act was enacted August 14, 1935. The Act was drafted during President Franklin D. Roosevelt's first term by the President's Committee on Economic Security, under Frances Perkins, and passed by Congress as part of the New Deal.
Other, similar, legislation soon followed. After considerable debate on the scope of the DNI's powers and authorities, the United States Congress passed the Intelligence Reform and Terrorism Prevention Act of 2004 by votes of 336â75 in the House of Representatives, and 89â2 in the Senate. President George W. Bush signed the bill into law on December 17, 2004.