Operator error in breath tests?

The Intoxilyzers didn't fail. They faithfully detected the presence of alcohol when 1,147 drivers blew into them.
But the mistakes made by humans were so basic - did anyone notice, for example, that 0.009 is a bigger number than 0.005 - that they raise questions about training and oversight in the Philadelphia Police Department.

Source: http://www.philly.com/r?19=961&43=166721&44=119164889&32=3796&7=195342&40=http%3A%2F%2Fwww.philly.com%2Finquirer%2Ffront_page%2F20110404_Operator_error_in_breath_tests_.html

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