BELLEVILLE, Ill. (UPI) - A judge in St. Clair County Circuit Court has declared unconstitutional the Illinois law making it a felony to knowingly trasmit the AIDS virus. Circuit Judge James Donovan made his ruling Thursday in dismissing charges against Carethea Russell, 18, Belleville, who was charged under the law with four counts of attempting to transmit the virus. Russell was charged after a St. Louis man told authorities she had sex with him last October without telling him she carried the AIDS virus. In a pretrial motion filed this week, public defender Clyde Kuehn argued on behalf of Russell that the 1989 state law was too vague and too broad. He said the law could make criminals of medical professionals who may transmit the virus and that the state's definition of ``trasmitting'' might include exposure through tears, sweat, sneezing or urinating. Kuehn argued that if the law was intended to bar people from spreading the disease through sexual contact, it should say so specifically. In his written order, Donovan agreed the law was vague, especially the provision that prohibited ``intimate contact'' by those who knew they had the AIDS virus. ``The court finds that the meaning of intimate contact with another as defined by the statute is overbroad, does not give adequate notice and criminalizes theoretical or hypothetical modes of HIV transmission,'' the judge wrote in his order. ``The medical community has discounted certain modes of transmission referred to by the defendant, but the medical community cannot exclude them as possible modes of transmission. ``The proscribed activities currently recognized by the medical community that result in transmission should be specifically enumerated in the statute,'' Donovan wrote. Prosecutors had argued the law clearly was aimed at prohibiting the spread of the virus through sexual intercourse and that criminal charges never would be pressed for the less likely modes of transmission. St. Clair County State's Attorney Robert Haida said he would appeal Donovan's decision. Haida said he was concerned about the possibility Russell would have unprotected sex with someone else without telling them about her condition. In his order, Donovan gave the state 21 days in which to file an appeal. He also said it could file other charges against Russell. The judge lowered Russell's bail from $25,000 to $20,000. However, Kuehn said Russell has been unable to get released on bail because she is subject to a hold order for a parole violation.