No not at all. Let's do it this way:

What percentage of people who drive drunk have consumed thc within the time window of blood detection?

Now this is a more reasonable number

I really don't know why this number is significant. Accidents are situational and people who engage in situations where accidents are more frequent likely make other decisions about consumption and lifestyle which involve things like cannabis

Who cares?

You aren't going to elevate the behavior of the population by regulating a plant