Rasheed Wallace has officially come out of retirement to join the New York Knicks, who announced the signing of the former Piston forward-center on Wednesday. The 38-year old Wallace last played for the Boston Celtics during the 2009-2010 season and was in the league for nearly 16 years. The four-time NBA All Star won an NBA Championship with Detroit in 2004. Meanwhile, N-B-A yesterday announced a new rule aimed at eliminating flopping. Any player guilty of flopping will be subject to a warning, followed by a $5,000 fine for a second violation. The penalty will increase $5,000 for a third and fourth violation, while a fifth flop will cost a player $30,000.  Six or more violations will lead to an increased fine and/or suspension.