GIRL, INTERRUPTED.

"Targeting the people, money and materials that support terrorist and criminal networks."

That's the tag line of U.S. Immigration and Customs Enforcement, charged with addressing vulnerabilities in the nation's border, economy and infrastructure.

And ICE agents thought they had spotted a red flag in June. While screening the passenger list of the cruise ship Fascination--docked in Miami--they noticed a warrant for the arrest of one Hope Clarke, stemming from a 2003 incident at Yellowstone National Park.

What type of mayhem could a 32-year-old teacher's aide from Riverton, Wyo., have been involved in? Picking wildflowers? Getting too close to Old Faithful?

The reason Clarke was rousted from her cruise ship cabin at 6:30 a.m., handcuffed and taken to jail was that she had left a bag of marshmallows on the ground at her campsite. That's understandably a no-no in bear country, but still.

Clarke was photographed and fingerprinted, and spent seven traumatic hours waiting in jail. "All I could do was cry," she says. "I was so upset I was throwing up. I experienced the first migraine of my whole life."

Clarke's offense--cited officially as "Improper food storage at a national park"--carried a $50 fine, which she claimed was paid before she left the park. The federal database said otherwise. Hence, the hullabaloo.

In court, all it took was a close look at the citation for U.S. Magistrate John J. O'Sullivan to ascertain that the fine had, indeed, been paid. He apologized to a visibly distraught Clarke, and two hours later she was a free woman.

Despite having her vacation cut short by about four days, Clarke says she accepts O'Sullivan's apology.

"I think he was sincere about it," she says, adding that she hopes the same thing doesn't happen to anyone else. "He told somebody to find out what happened."