When I went to see Robert Plant in Detroit a few months ago I had a bit of a hassle crossing the border. I had my Passport with me, but my friend only had his drivers license. I guess apparently he was told that the newer versions work as I.D when crossing. But the guy at the border gave him a hard time saying that wasn't enough. You may ok with just a birth certificate, but I would bring 2 pieces of I.D with you if you don't have a Passport. The Detroit border has always been more strict than the Buffalo border.