According to a Norwegian estimate the tripling of the number of random breath
tests could lead to a 3% reduction in the number of fatal accidents, and the benefits would exceed the
costs by a factor of 1.2.35 An American cost benefit analysis indicates that a zero BAC limit for young
driver would give benefits that exceed costs by the factor of 11.16
The results from the Netherlands indicate that the law of diminishing returns applies for random
breath testing. This means that for each similar consecutive increase in RBT level the benefits are
smaller than for the previous increase.