AdvertisementThe story about how the Uvalde gunman entered the school is shiftingJune 01, 2022Bill ChappellLaura BenshofffacebookEmailBalloons and caution tape are seen at the entrance to Robb Elementary School in Uvalde, Texas, on Tuesday. Investigators had initially said a teacher left a back door propped open at the school, but that account has now shifted. (Getty Images)