WOODBURY - The Food and Drug Administration (FDA) today approved a measure allowing over-the-counter HIV tests to hit pharmacy shelves for the first time ever. The new, at-home test is targeted to people who might not get tested otherwise. Experts estimate that one-fifth of people who are HIV postive, or about 240,000 people, don't know they have the disease. The OraQuick test detects HIV in saliva collected through a mouth swab and gives results in 20-40 minutes. The FDA warns, however, that the test is only about 92 percent accurate. Some medical experts say they're concerned about test-takers who may get false positives or negatives.