 Aldo's rate of success during these sessions was described as "really good".The dog's training records, which the officer began keeping six months prior to Harris's stop, showed that on a dual grade of "satisfactory" or "unsatisfactory", Aldo performed "satisfactory" 100% of the time.The officer did not track false positives, nor did he explain whether any false positive alerts by Aldo would affect his "satisfactory" performance rating.