That is true, but like the article stated, there is much more relation and science affirming the connection between BAC and an impaired ability to drive than there is due to pot. And I'm sure that there are plenty of people that simply don't get caught, and more that would otherwise not get caught if it weren't for checkpoints.

If we don't have the science, technology, nor a fair way to test, I'm not sure how making pot-specific laws is going to help do anything other than make people feel like something has been done.

At least with better controls and better general laws, it makes everyone safer. People that can't drive accordingly, regardless of any drug, probably shouldn't be driving at all.