The Saudi national who was initially detained and then ruled out as a suspect in the Boston Marathon terrorist attack had been flagged on a terror watch list and was granted a student visa without being properly vetted, sources have told me. A source close to the investigation revealed that Abdul Rahman Ali Alharbi had been deemed inadmissible under the section of the Immigration and Nationality Act which declares ineligible for a visa – any alien who is engaged in or is likely to engage after entry – in terrorist activity. At least two additional sources have confirmed to me...