Account-1: @azelin (Twitter)Account-2: @David_J_Bier (Twitter)Account-3: @azelin (Twitter)Scholar: Bier, DavidDate: Wednesday, April 18, 2018Body: Extreme Vetting of Immigrants: Estimating Terrorism Vetting Failures - @David_J_Bier, @CatoInstitute:Link: https://twitter.com/azelin/status/986583749709193216Social Action: featured in a tweet