The New York Civil Liberties Union is urging the New York City Council and New York state Attorney General to conduct a full investigation into police practices during the Republican National Convention. The NYCLU said it was particularly concerned with the department’s use of mass pre-emptive arrests, pervasive police surveillance, excessive delays in processing arrestees and the conditions at Pier 57 where many of the 1800 arrested were held. Detainees reported being held in a former bus depot covered with soot and oil__. The civil liberties union has announced it is testing a sample gathered by a medic who was detained.