The California Policy Research Center has published the executive summary of a study of drug testing in three California probation departments. (The full report should be on line in a week or so; in the meantime, I can email the draft to anyone who wants to see it.) The findings, and my take on them, are about what you would have expected: sporadic testing, with most probationers not tested at all; noncompliance (failure to show or a dirty test) of about a third, on a per-test-ordered basis, lackadasical sanctions process. The human subjects Nazis at UCLA decided we couldn't talk to any probationers, so their voices are missing.