Miscellaneous > The Lounge

alcohol breath testers give known false readings

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davidnix71:
The company that markets the roadside tester tried to hide their code, claiming it would hurt business.

http://www.schneier.com/blog/archives/2009/05/software_proble.html

Error checking is disabled, the results are not averaged correctly and precision is trashed by downsampling.

Lead Head:
Nuts that they even bothered including the hardware capable of relatively high precision, only to pretty much throwout most of the data. I guess more software does indeed need to be open source. While you shouldn't be drinking and driving regardless, only around 4 bits of accuracy can be the difference of going home free, or getting busted for a DUI.

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