New Jersey has the fifth highest number of AIDS cases in America, and yesterday became the last state to allow intravenous drug users to get clean needles, hoping it will slow the spread of the deadly virus. Gov. Jon Corzine ended a 13-year stalemate by signing a law to permit six communities to host needle exchange sites, where clean syringes and referrals to drug treatment will be available. The bill includes $10 million for drug treatment and counseling programs. "This is an historic day for public health," Corzine said, calling the law "a potential bridge to hope for addicts." After...