I have no qualms with a tiered approach. However, the legal limit is 0.08. That's what it is here, if you're below 0.08 you are not legally impaired. How is it reasonable to force penalties upon someone who is almost breaking the law? I have no issue with changing the limit to 0.05 and then keeping the current tiered system either, but that hasn't been done. Would you also support pulling people over and giving them tickets for almost speeding?
The "legal" limit is NOT .08 in Ontario. It is .05 BAC.
A corresponding analogy is the difference between varying degrees of reckless driving. Up to a certain point, reckless driving acts are only considered to be Careless Driving and subject to non-criminal provincial regulatory sanctions. Exceed that point though, and the reckless driving acts will be deemed to be Dangerous Driving and dealt with under the federal Criminal Code with accordingly harsher penalties. Both Careless Driving and Dangerous Driving are illegal acts, but the applicability of each requires a specific threshold to be met.
The same goes with varying levels of impairment. The .05 BAC level is the non-criminal regulatory level of per se deemed impairment set by the province. The .08 BAC level is the "criminal" threshhold of per se deemed impairment.
Each level represents a different degree of negligence on the part of the impaired operator. Marginal negligence or poor judgment should never be sufficient to criminalize a person. Criminalization should be saved for those whose actions go well into what we know to be wrong.