if they move slowly, it would go slowly. at one point in the middle of the cycle, if there is a weapon it will be detected by at least a metal detector. the portal would stop, give a message to reverse direction. the person would be backed out of the portal. >>steve: as the person is enclosed, it is a scan, would it back the person out or trap them between the two walls. >> you don't want to trap people in anything. you would reverse them out. the main thing is keep the weapon out of the building. >>steve: for practical purposes, i can see it being used in sports venues. how many people can you get through this mechanism at maximum capacity? >> the real -- once we build the prototype we'll be able to test it with people going through. the idea is it can move as fast as someone can walk.