Intoxilyzer 5000 in need of maintenance. 100 alcohol standard at 34C. Note high cal. checks on ACACA and ACABA sequences. Calibration check system (sample chamber, interferent detect/subtract/add circuitry, tubing, simulator, or standard) has been compromised by previous experiments bubbIing mixture of cold 50 mg/100mls standard and GOJO containing limonene. Quaere: Once there has been any indication of an "Interferent" should the alcohol standard be changed? Should any "Interferent" flag since last alcohol standard change be disclosed to the defence since the alcohol standard may not be reliable? Intoxilyzer® is a registered trademark of CMI, Inc. The Intoxilyzer® 5000C is an "approved instrument" in Canada.