That's why we haven't put them in our airport." Again, despite the scanners, the TSA has been unable to stop weapons like box cutters and pistols from being carried onto airplanes. The Australia government has been challenged over the effectiveness and cost of full body scanners by public media to which Australian Transport Minister Anthony Albanese has said he "makes no apologies" for mandating the installation of full body scanners at Australian airports. Two alternatives that have been argued for by experts, such as Prof Chris Mayhew from Birmingham University, are chemical-based scanners and bomb-sniffing dogs. Others have argued that passenger profiling, as done by Israeli airport security, should replace full body scanners and patdowns. Transmission (penetrating) Unlike the above, transmission technology allows to detect objects swallowed or hidden inside the objects. This is the main reason it is commonly used in prisons and jails. However the current technology does not allow the dual-energy body scanning (and detecting the object by its atomic number like it is used in baggage or vehicle X-ray scanners) which could give the image the same detection effectiveness as regular black and white X-ray. This leads to the idea that human-held detection (finding threats by looking at the image and finding non-common to the human body items) is the most effective way to find a contraband. However counting a human factor (fatigue, decreased attention) threats still could be missed. Modern software based on Artificial Intelligence in full body scanners is designed to minimize human faults and rise the detection effectiveness of this method. US public opinion A Gallup poll given just after the 2009 Christmas Day bombing attempt suggested that 78% of American airline travelers approved of body scanners while 20% disapproved. 51% indicated that they would have some level of discomfort with full-body scans, while 48% said they would not be uncomfortable with the idea. The poll was given in the context of the 2009 Christmas Day bombing attempt, and some opponents of full body scanners say that the explosives used in that bombing attempt would not have been detected by full-body scanners. An ABC/Washington Post poll conducted by Langer Associates and released November 22, 2010, found that 64 percent of Americans favored the full-body X-ray scanners, but that 50 percent think the "enhanced" pat-downs go too far; 37 percent felt so strongly. In addition the poll states opposition is lowest amongst those who