If any one Cup track has a security issue it would certainly be the Brickyard. I went there twice (2006 ans 2007), got there very early so I could get the good parking. There they let you park in the infield for free. You pull your car up, roll down your window and someone takes your stub and you are in. There are no further checks at all. You could literally bring ANYTHING into that place. If you wanted to you could sneak an extra person in for free if they were willing to lay in the trunk while you are going through the gate!