Main simulator has 100 SAS at 34.0C. This video is a sequel to two longer videos. Experiment using cold extra simulators at 40 mgs/100mls and 100 mgs/100mls gradually warmed to simulate slow changes in ambient ethanol in room air. Instrument does not trigger "Ambient Fail" because the change is gradual. The results of this experiment show why it is very important for the operator to control breath room ambient conditions and pay close attention to any indications of bizarre ambient conditions. Those indications may include strange cal. checks, ambient fail messages, and others in the weeks before and after the subject tests. In order to make full answer and defence respecting the issue of instrument reliability the defence needs full disclosure of conditions that affect the SAS reliability including expiry, stability, temperature, AND AMBIENT CONDITIONS IN THE BREATH ROOM. Please note that the need for such full disclosure is even more important if ambient conditions potentially include ethanol PLUS INTERFERENTS such as limonene.