The systems can pick up everything, think the X-ray system at airports but on a large scale, the issue is humans have to be able to quickly scan the info and decide what to do. The tech has the ability to identify most items of concern and redline the guests carrying the items, example the machine sees a small knife on my person or in my bag it will then use a red outline to identify me and alert security. The problem the machines do have is false positIves and items that block the machines from seeing, think water bottles, rf blocking wallets and certain bag linings. It will speed up the process immensely but there will be growing pains like most technology. Disney can basically program the machine to pick up whatever it wants too within reason.