FILE- In this Jan. 9, 2017 file photo, Esteban Santiago, right, accused of fatally shooting several people and wounding multiple others at a crowded Florida airport baggage claim, is returned to Broward County's main jail after his first court appearance in Fort Lauderdale, Fla. Authorities say such walk-ins are a daily occurrence around the country. Assessing whether the people are reporting a credible threat or whether they need medical help is extremely difficult and drains already-stretched law enforcement resources. (AP Photo/Alan Diaz, File)
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