Mexican teachers rally against magisterial evaluation Teachers camp at Mexico City's main square during a demonstration held by the Na...

Mexican teachers rally against magisterial evaluation

Teachers camp at Mexico City's main square during a demonstration held by the National Coordination of Education Workers against a magisterial evaluation, in Mexico City, Mexico, on March 15, 2012. (Xinhua/Claudio Cruz)

A woman walks past riot police during a demonstration held by the National Coordination of Education Workers to protest against a magisterial evaluation, in Mexico City, Mexico, on March 15, 2012. (Xinhua/Claudio Cruz)

Teachers camp at Mexico City's main square during a demonstration held by the National Coordination of Education Workers against a magisterial evaluation, in Mexico City, Mexico, on March 15, 2012.