After reports that Dallas’s second Ebola transmission case, nurse Amber Vinson, flew to Cleveland and returned home just a day before her symptoms appeared, the CDC and the Transportation Security Administration are taking steps to make sure that doesn’t happen again. Local Dallas reporter Lauren Zakalik tweeted that CDC officials told her there is a “do not board” list that will evolve to cover potentially exposed people. “I wish I had more details but the [CDC] was not very forthcoming,” she said.