Fair enough. Then you will understand that almost all of the components to make up a technological solution currently exist in one form or another and many are already utilised at ports and major distributors. In addition there are a host of defence and security related products available for use. What has not been done, as you are well aware, is to fully define what the system requirements would be. While technology exists, the political will to put in place the technical solution has not.
That does not mean that it cannot be done, just that there is no ots system or solution currently available to undertake the demands of NI/ROI nor any agreement between the U.K./EU on what such a system needs to fully address. I raised this 3 years ago and said at the time that the technology exists but that a half billion or so would need to be thrown at the system requirements, design, build, test and install. It’s all doable. The political issue of course has always been that if a free trade deal were completed, then the system would not be required, hence the foot dragging......