Originally posted by durrelllrobert
I wasn't aware thate they are now using breathalizers in MX. The 0.08 limit is ony 100% accurate only by direct measurement (blood test). Because
the breathalizer measurements are indirect estimations, they must always be calibrated for precision. Improper calibration is a frequent reason for
discounting the analyzer results at trial (in the US anyway)..
Technical issues with the devices include sensitivity to ambient temperature as well as subject temperature; failure to properly account for
variations in the human hematocrit (cell volume of blood) range; and false assumptions of the conversion factor used in converting lung air alcohol
concentration to blood alcohol concentration.
Many alcohol breath analyzers assume a 2,100-to-1 conversion factor, but the ratio varies from person to person and within a person over time. All
these factors can increase a BAC reading.
When, how and by whom are they calibrated in Baja? |