Never mind...I can see by the info below it happened because the Rangers are broke and could not afford to stop it by claiming him on waivers....
"Kazmir is earning $6 million this season in the first year of a $28.5 million, three-year deal he agreed to in May 2008. He is owed $8 million next season and $12 million in 2010, and his contract contains a $13.5 million club option for 2012 with a $2.5 million buyout."