It surely cannot be good legislative practice to make laws solely for one person, even if it seems to be the right thing at the time. In general it is thought to be good practice that a law should address a particular form of behavior rather than a specific individual or group.

Although Congress has in the past passed laws for individuals, such as when Congress passed a law in 1963 making Winston Churchill an honorary American citizen ( http://www.winstonchurchill.org/learn/biography/redux/church... ).

This use of legislation in the UK was also in effect from 1300-1800 and called a bill of attainder.

http://en.wikipedia.org/wiki/Bill_of_attainder