[johnmarcus]

>The key is finding a limit that allows police to identify actually impaired drivers while giving those with tolerance enough leeway to avoid being falsely charged

Given that is an impossible statement, it sounds like you are admitting this will be used to falsely prosecute more people than it will let off the hook. This is a smash and grab that will adversely effect society, not help it. You keep comparing it to alcohol, but you should be comparing it to adderall. Do you think society needs adderall testing curbside as well?