Software Problems with a Breath Alcohol Detector (Schneier on Security)

Schneier on Security:
Software Problems with a Breath Alcohol Detector  —  This is an excellent lesson in the security problems inherent in trusting proprietary software: … Draeger, the manufacturer maintained that the system was perfect, and that revealing the source code would be damaging to its business.

Source: Software Problems with a Breath Alcohol Detector (Schneier on Security)