By David Tuller
In December 2008, after a weekend of sex fueled by methamphetamine, Chris, a San Francisco man in his early 30s, sought out testing for sexually transmitted diseases at Magnet, a clinic serving homosexual men in the city’s Castro neighborhood.
Staff members tested him for H.I.V. twice: first with a standard rapid test, which detects H.I.V. antibodies in saliva or a drop of blood, then with a blood test for genetic traces of the virus itself.....
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