ACLU suit against ATF?
Joe Huffman reports on it. A lady was driving around on April 19, 2006 (the anniversary of the Waco fire) with "remember the children of Waco" written on her windows, and got pulled over and questioned. At least from the description, it sounds like local police, rather than ATF, stopped her.
Ah, here's more. But not much more, and the link to the judge's order is inoperative.
UPDATE: comments have a good link to the judge's order. It appears that ATF asked local police to make the stop. One question to me is how the communication with the local ATF would have turned up that she had a CCW permit.