ajtj, Testing the DNA of Weyerhaeuser 2x4's is not necessary YET, however ,if you are referring to an exotic high strength wood like Zeev often refers to protect his financial a-- from heavy weight, then you may be correct. Whether a Doug fir or a western hemlock growing on the north vs. the so. side of the border would have different DNA is debatable, it would get darn right difficult to test those straddling the border.