Please note that while every effort has been made to provide accurate information, no part of this article constitutes legal advice.   The question "Am I too stoned to drive?" is a tricky one to answer objectively. While there are various rules of thumb and gadgets like keychain breathalyzers for alcohol, even lawmakers and police have trouble clearly defining impairment when it comes to weed. To complicate matters further, we live right on a state border here in Vancouver, and there are different rules in Washington and Oregon. That means that it's technically possible to be good to drive on one side of the river, but not on the...