question about cameras in the dome

I was checked at the door for my SLR at the game before last. I have a teloscoping lens that is about 6" long and they set it down on a table that had a drawing of a camera with a line at the edge of the camera and another 6" away that measure the length of the lens. my camera just passed the test but just. I guess I could take off the rubber glare blocker which would of given me another - 1/4"

this lens took very good pictures from the upper box section 1st row. I would bring it again but I found it in the way of watching the game.