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Stephen Biss
Oct 12, 20224 min read
Change of Response at One Point but Not at Another Point that is Equivalent
Purpose: To suggest that there is empirical evidence in the matter before the Court of change in response by the approved instrument at...
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Stephen Biss
Sep 7, 20223 min read
Ambient Fail Threshold 5, 10, 19, 20 ?
We know that the ambient fail threshold (the mg% point at which the exception error is flagged) on both the Intoxilyzer 5000/5000C and...
22 views0 comments


Stephen Biss
Sep 4, 20223 min read
Reliability: 64 in 2011 Ambient Threshold Changes, Elevated Zero, Purge Fail
This is the same Intoxilyzer® 64 with upgraded keyboard and (software) serial number depicted in the blog "Ambient Conditions Change...
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Stephen Biss
Sep 2, 20222 min read
Reliability: Cal Checks in the Context of Earlier & Later Ambient Fails
Tip 47: A calibration check using a wet-bath simulator containing alcohol standard is not reliable if information is missing about air...
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Stephen Biss
Sep 2, 20222 min read
Ambient Conditions Change Baseline 0 on an IR Breath instrument - Disappearing Alcohol
Experiment studying the phenomenon of disappearing alcohol It is easy to replicate this experiment on an Intoxilyzer® 5000. It is more...
6 views0 comments
Stephen Biss
Aug 31, 20222 min read
Reliability: Disabling Ambient Fail Exception, Making Alcohol Disappear
Tip 45: Study the breath room video and learn everything you can about the breath room and detachment. Watch for: Has the qualified...
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Stephen Biss
Apr 9, 20223 min read
Reliability - Calibration is a Curve
Tip 50: When an "approved instrument" is calibrated at the factory, the manufacturer doesn't simply adjust the electronics in the...
15 views0 comments


Stephen Biss
Jan 15, 201813 min read
Is an Approved Instrument Really a Screening Device?
Purpose: To suggest that an AI is a quantitative analysis instrument and an ASD is a qualitative analysis instrument and suggest that the...
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Stephen Biss
Jan 13, 201817 min read
R. v. Vallentgoed Distinguished on facts - Short Calibration Interval
Purpose: To obtain admissions from the Crown expert to enable argument that Vallentgoed can be distinguished on its facts - particularly...
6 views0 comments


Stephen Biss
Jan 11, 20184 min read
Bandwidth of Filters Changes Over Time
Sample cross-examination of CFS scientist on aging IR filters. IR instruments use light filters at the end of the sample chamber. As...
26 views0 comments
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