texas cop fire video surface show body slam 12-year-old girl grind joshua kehm uniform police officer work san antonio independent school district rhodes middle school.the incident happen march 29 capture student cell phone.in video uniform officer see struggle girl slam grind officer appear handcuff girl stand lead away.gloria valdez 12-year-old girl mother tell cbs affiliate kens completely uncalled supposedly threaten kick video legs never go valdez said.valdez daughter want go camera tell kens conversation another girl crowd surround say officer put hand her.the mother tell local tv station slam vicious daughter lose consciousness remember handcuff cop also reportedly bruise confrontation.the school district suspend officer spokesperson tell tv station go tolerate excessive force district video late unsettle series videos often record students show police officer use appear excessive force subdue children videos often go viral youtube social media help create backlash so-called zero tolerance policies become popular early mid-1990s.at time rather admit videos show disturb pattern police unions conservative politicians support legislation criminalize record police rather assess obvious problem poor police train behavior.featured image via youtube watch cop catch video body-slamming 12-year-old girl