Just Like Radar, Cop Breathalyzer Results Vary
"This is an excellent lesson in the security problems inherent in trusting proprietary software:
After two years of attempting to get the computer based source code for the Alcotest 7110 MKIII-C, defense counsel in State v. Chun were successful in obtaining the code, and had it analyzed by Base One Technologies, Inc.
Draeger, the manufacturer maintained that the system was perfect, and that revealing the source code would be damaging to its business. They were right about the second part, of course, because it turned out that the code was terrible."