So we're planning on racing the 500. I've been hearing lately that a new law is requiring US citizens to carry passports if they are in Mexico more than 72 hours or go more than 20km below the border. Can anyone confirm or deny this? Urban legend? I've searched a bit on the internet and haven't found anything, but maybe the websites I visited are outdated? If this is true, then my crew needs to get on the passoport thing soon if we're going to do some prerunning this spring.