The full report is titled “Motor Vehicle Crash Fatalities in States With Primary Versus Secondary Seat Belt Laws. A Time-Series Analysis.” It is in the 4 August 2015 issue of Annals of Internal Medicine (volume 163, pages 184–190). The authors are L.K. Lee, M.C. Monuteaux, L.C. Burghardt, E.W. Fleegler, L.E. Nigrovic, W.P. Meehan, S.A. Schutzman, and R. Mannix. This article was published online first at www.annals.org on 23 June 2015.