21. And dlrs 4 million has been spent equipping conference buildings with metal detectors and security scanning machines . 22. And it's the reason why not every voter was stuck with butterfly ballots or cranky ballot-scanning machines . 23. Currently, the building has scanning machines . 24. The subjects, 13 undergraduates, were deceived into thinking that they were playing with people under other scanning machines . 25. Yet, although this was achieved, there were still scanning machines in fewer than 200 grocery stores by 1977. 26. Operators of scanning machines must stop the machine to look at each image as carry-on luggage passes through. 27. In Seminole County in central Florida, elections officials ran out of ballots for its new optical scanning machines . 28. But ballots jammed in optical-scanning machines . 29. The state is using eight scanning machines reading refund requests but faces a backlog of about 10, 000 forms. 30. This spring, scanning machines recorded the number of weevils in traps, to decide where more spraying will be needed.