The federal government's war on drugs has turned into a witch hunt for doctors who legitimately prescribe legal painkillers, says a California physician who claims he was the target of an unethical federal investigation. "The war on drugs has become a war on sick people," Dr. Frank Fisher said Friday. "The war on drugs has morphed into a war on patients, and the doctors are caught in the crossfire." Fisher said the battle has erupted in Billings, where the Drug Enforcement Administration is investigating neurologist Richard A. Nelson. Nelson treated multiple chronic-pain sufferers with opioids, or narcotic painkillers, until federal...