“More than thirty of the fifty states in the U.S. have prosecuted HIV-positive individuals for exposing another person to HIV. Their laws criminalize different behaviors and assign different penalties. A person diagnosed with HIV who infects another while engaging in sexual intercourse is, in many jurisdictions, committing a crime. A person donating HIV-infected organs, tissues, and blood can be prosecuted for transmitting the virus. Spitting or transmitting HIV-infected bodily fluids is a criminal offense in some states, particularly if the target is a prison guard. Some states treat the transmission of HIV, depending upon a variety of factors, as a felony and others as a misdemeanor.”
http://en.wikipedia.org/wiki/Criminal_transmission_of_HIV_in_the_United_States
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