Four out of five incoming prisoners have been tested for HIV in North Carolina as the result of an improved HIV testing program implemented November 1, the News & Observer reports.

According to the article, the North Carolina Department of Correction and the state Division of Public Health expanded a previous testing program that only offered HIV testing on a medical evaluation as inmates entered the system or when they requested one. With the new guidelines, every incoming inmate is offered testing; after receiving HIV counseling, inmates may waive the test, but they can request one at any time during their incarceration.

Of the 2,163 inmates who entered the states prisons in the past month, 1,784 were tested for HIV. Ten were diagnosed with the virus; they had no prior knowledge of their status.