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总结
美国得克萨斯州尤瓦尔迪（Uvalde）校园枪击案相关庭审出现戏剧性转折：一名关键证人在法庭上改变此前证词，使控辩双方对警方当时是否已获知枪手位置、是否具备及时处置条件产生新的争议。检方指控一名前学区警官在接获有关枪手位置等信息后仍未采取有效行动，未能阻止枪手进入校园并最终导致19名学生和2名教师遇害。证词变化可能影响责任认定与案件走向，并再次引发对执法响应、应急指挥与问责机制的讨论。
正文
Uvalde trial takes dramatic turn as key witness changes testimony Texas Public Radio | TPR Former Uvalde school officer accused of failing to act against shooter who killed 19 students, two teachers Yahoo Exclusive: Uvalde school cop was told where gunman was before he got into school building CNN Officer did nothing until it was too late during Uvalde school shooting, prosecutor says The Texas Tribune Uvalde officer was told location of gunman but he failed to act, prosecutors say ABC News
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