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5/21: PSA test found unreliable, hard lessons from Joplin

|A top government panel says the PSA test for prostate cancer is unreliable giving a falsely positive result 80 percent of the time; Then, a study on the relationship between U.S. allies and the Afghans they are training provides insight into possible reasons behind attacks from the Afghan soldiers; Also, Joplin, Mo. has spent the last year rebuilding from a deviating tornado and one Joplin graduate learned some hard lessons along the way.