It's often said (and this has been repeated here) that we cannot have a hard border with Ireland because of the Good Friday Agreement (Belfast Agreement). Obviously, this would only apply to goods anyway because the UK and Ireland have a Common Travel Area which predates the EU and its predecessors, but can someone point out to me which part of the GFA it would breach?
You can get a copy of the GFA here www.gov.uk/government/uploads/system/uploads/attachment_data/file/136652/agreement.pdf and its only 35 pages long so it won't take long to read. Remainers will obviously be very keen to show me.