A former D.C. police officer admitted Thursday to falsifying logs regarding the testing of mobile photo-radar cameras that issue speeding tickets — a move that resulted in the department having to refund more than $17,000 in traffic ticket fines. ... the 22-year department veteran was supposed to be monitoring photo-radar equipment during overtime shifts and taking test photographs once an hour with the cameras to ensure they were working properly. In 2008 and 2009, prosecutors said Mr. Cephas failed to take the once-an-hour shots on 33 occasions and covered up the mistakes by rolling back the clock on the radar...