Impact of prolonged cannabinoid excretion in chronic daily cannsbis smokers' blood on per se drugged driving laws - Bergamaschi, Mateus M.; Karschner, Erin L.; Goodwin, Robert S.; Scheidweiler, Karl B.; Hirvonen, Jussi; Queiroz, Regina Helena Costa; Huestis, Marilyn A. (Clinical Chemistry, 2013)