Do public school teachers get tenure just by breathing?

The mayor of New York decides to "overhaul" tenure, instead giving them tenure, based on improving test scores. 

Matthews, By Bebeto. "NYC Takes Aim at Teachers' 'tenure for Breathing' - USATODAY.com." News, Travel, Weather, Entertainment, Sports, Technology, U.S. & World - USATODAY.com. Web. 19 Oct. 2010. <http://www.usatoday.com/news/education/2010-10-08-teacher-tenure_N.htm>.