Observed DUI arrests and computed arrest probability
| BAC (%) | Estimated vehicles* | Observed arrests | Computed P(A1[|]Bj) |
|---|---|---|---|
| *Distribution estimated from the volunteer survey.2 | |||
| †The seemingly spurious result that the probability of arrest is less at a BAC of over 0.35% than at a BAC of 0.30–0.34% probably arises because the driver who has a BAC over 0.35% will be the driver most likely to be physically unable to undergo a breath test. In the rare cases when a blood test was required, the results were not entered into the Kansas City police computer, from which P(Bj|A1) was obtained. | |||
| ‡The two breath test refusals have been included in the >0.15% category. | |||
| 0 | 40 000 | 0 | 0.000000055 |
| 0.01–0.04 | 11 800 | 0 | 0.0000013 |
| 0.05–0.09 | 3 540 | 0 | 0.000124 |
| 0.10–0.14 | 2 360 | 7 | 0.00244 |
| 0.15–0.19 | 890 | 6 | 0.0105 |
| 0.20–0.24 | 240 | 6 | 0.0195 |
| 0.25–0.29 | 50 | 1 | 0.0258 |
| 0.30–0.34 | 6 | 0 | 0.0565 |
| 0.35–0.39 | 1 | 0 | 0.029† |
| ≥0.10 | 3 547 | 22‡ | 0.0058 |
| ≥0.15 | 1 187 | 15‡ | 0.0133 |