There is a long history of both the TSA and private citizens testing the limits of the security checkpoints at the airport. I've even known one of the more infamous private citizens to do so in the TSA's existence. Supposedly the new full body scanners which are extremely invasive are supposed to detect such items, and others such as firearms so that the flying public is safe (at least that is how the Department of Homeland Security has been able to pacify the majority of citizens and politicians into supporting these new procedures). Unfortunately, as it was back early in the days of the TSA, they are unable to detect real threats, even with new technology that performs invasive searches.
There was a recent testing of the nude-o-scopes at DFW, and the machines achieved one of the most epic failures that I have ever seen. From the report:
The source said the undercover agent carried a pistol in her undergarments when she put the body scanners to the test. The officer successfully made it through the airport's body scanners every time she tried, the source said.
With most industries, a failure rate of 100% in a test is cause to halt the program until the root causes of the failure have been determined. There would be meetings with stakeholders to figure out what the problem is, be it faulty training, incompetence, or general ineffectiveness of the machines. Something would have been done immediately to address the problem. At the very least the agents who failed to detect a firearm with the machines would have at least been put under investigation or probation for their complete and utter failure to perform their jobs (those 5 checkpoints would make great scapegoats for those who want to preserve the invasive procedures).
While personally I would like to see the machines removed and actual security implemented, I do understand that for political reasons the machines are here to stay unless there is a complete uprising against these machines by travelers of all levels. I could tolerate the day when the nude-o-scopes became the standard if they actually worked and were operated by professionals. As it is, they are not and will not be unless the TSA performs a complete overhaul of their staffing and attitude.