Three San Diego doctors [all psychiatrists] who prescribe medications at the same time they are paid by drug companies as experts on the products figure into a broader national debate about whether playing both roles poses a conflict. California Watch, a project of the independent, nonprofit Center for Investigative Reporting, compared two sets of data at the center of the debate — one a database of payments by drug companies to doctors nationwide and the other a list of the top antipsychotic prescribers in California’s Medi-Cal program for the poor and disabled.