Lets see if slashdot considers it relevant -- no source code -- no DUI convictions. Full story at
"Hundreds of cases involving breath-alcohol tests have been thrown out by Seminole County judges in the past five months because the test's manufacturer will not disclose how the machines work."
"if a DUI defendant asks for a key piece of information about how the machine works -- its software source code, for instance -- and the state cannot provide it, the breath test is rejected"
If all else fails, lower your standards.