The Government has not made a convincing case to opt-out of about 130 EU police and criminal justice measures and that to do so would have significant negative repercussions for the UK’s internal security. The Committee has also been disappointed with the lack of engagement by the Government with Parliament, the Devolved Administrations and key stakeholders. The European Arrest Warrant (EAW) is the single most important pre-Lisbon police and criminal justice measure and, if the Government decides to exercise the opt-out, then it should opt back in to the EAW immediately, so as to avoid any gap in its application. The Committee was also particularly concerned about the potential impact that the opt-out, including the loss of the EAW, could have on efforts by the UK and Ireland to effectively tackle cross-border crime and do not believe that possible alternatives to the EAW would be adequate