Table 1.
Measures of Non-Compliance with Interlock Requirements
Measures | Definitions of Measures of Non-Compliance |
---|---|
Initial Fails ≥.025 5 minutes |
Initial breath test failure BAC≥.025 per 1,000 engine starts 5 or more minutes apart |
Initial Fails ≥.025 60 minutes |
Initial breath test failure BAC≥.025 per 1,000 engine starts 60 or more minutes apart |
Initial Fails ≥.04 5 minutes |
Initial breath test failure BAC≥.04 per 1,000 engine starts 5 or more minutes apart |
Initial Fails ≥.04 60 minutes |
Initial breath test failure BAC≥.04 per 1,000 engine starts 60 or more minutes apart |
Initial Fails ≥.08 5 minutes |
Initial breath test failure BAC≥.08 per 1,000 engine starts 5 or more minutes apart |
Initial Fails ≥.08 60 minutes |
Initial breath test failure BAC≥.08 per 1,000 engine starts 60 or more minutes apart |
Total Fails Weighted | Weighted average of failure rates = (.025 + 2 × .04 + 4 × .08)/7 |
Total Non-compliance | Weighted sum of non-compliance rates = (7 × total failures + disconnects + retest refusals + retest failures + startup violations). |
Disconnects | Disconnecting power to the hand set or ignition interlock per 1,000 engine starts |
Retest Refusal | Rolling retest was requested but no breath blow was provided per 1,000 engine starts |
Retest Failure | Rolling retest breath blow provided was ≥ .025 per 1,000 engine starts |
Startup Violationa | Starting the vehicle by by-passing the ignition per 1,000 engine starts* |
Initial Passes Per Month | Average number of initial breath tests passed per month |
Vendor manuals provided to drivers assigned to ignition interlocks offer several different interpretations of “start-up violations.” In some cases, the “violation” may be inadvertent rather than deliberate, when the driver follows incorrect procedures or there is a hardware problem. However, the term “start-up violation” usually means that the driver has circumvented the proper operation of the interlock system either by providing a jumper wire across the interlock relay or by providing battery power directly to the vehicle’s starter.