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总结
在美国得州尤瓦尔迪（Uvalde）校园枪击案相关审判中，一名前学区警官因被控在2022年罗布小学枪击事件中未及时组织、指挥并采取有效行动制止枪手而受审。庭审出现戏剧性转折：关键证人对先前证词作出改变后，辩方以程序公平受影响为由申请宣布审判无效（mistrial），但法官裁定驳回该动议。案件将继续审理，其结果可能影响对执法处置失当的责任追究，并再度引发对校园安全与警务响应机制的讨论。
正文
Uvalde officer trial: Judge denies defense motion for mistrial abcnews.go.com Uvalde trial takes dramatic turn as key witness changes testimony Texas Public Radio | TPR Judge in trial of former Uvalde school police officer denies defense motion for mistrial CNN Former Uvalde school officer accused of failing to act against shooter who killed 19 students, two teachers Yahoo Jury seated for trial of former Uvalde school police officer San Antonio Express-News
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