[Betty Jane]

Here's how this dry run test could work and provide information to a terrorist. He places his suitcase down and leaves.

He grabs a newspaper or smokes a cigarette and goes back after 10-15 minutes. If the bag is still there, he has found a potential target. If it's gone or otherwise discovered, he knows this spot is no good.

He now has a list of good spots and times to leave his package. The thing nobody else would know is how many places he found secure. That is what is scary.

[motzman]

For all we know there were 25 suitcases placed, and nobody noticed the other 20 for quite a long time, and the terrorists went back and retrieved them. Those five locations we discovered have been "scratched".