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The analyzer, about the size of a laser printer, initially will be used to determine kinship among refugees and asylum seekers. It also could help establish whether foreigners giving children up for adoption are their parents or other relatives, and help combat child smuggling and human trafficking, said Christopher Miles, biometrics program manager in the DHS Office of Science and Technology.

Only DNA can positively determine family relationships, Miles said Wednesday during a conference on biometrics and national security.

Eventually, the analyzer also could be used to positively identify criminals, illegal immigrants, missing persons and mass casualty victims, he said.

As pro-democracy demonstrators gain control of more cities in eastern Libya, Muammar Gaddafi’s many properties in the hands of protesters have been ransacked and destroyed.

One such palace sits on the outskirts of Benghazi, Libya’s second largest city and the de facto capital of the revolution.

Set in beautifully landscaped gardens, with a covered swimming pool, a sauna and a jacuzzi for Gaddafi and his guests, the palace offers a glimpse into the fortified world of a leader, who, according to US diplomatic cables released by WikiLeaks, suffers from a severe phobia.

With a fully equipped underground shelter designed to keep the leader safe for several months, in case of an attack involving use of unconventional weapons, the palace is more than just a luxurious castle.

The bunker in the palace has a fully serviced air filter system and is also equipped with emergency generators, fire alarm, water pumps, and a ladder fixed in what could have served as a back emergency exit to help the leader escape.

But here he was, two years left on his sentence for grand theft, bent over in a field, snapping wide, green collard leaves from their stems. For the rest of the week, Mr. Ivey and his fellow inmates would be eating the greens he picked, and the State of Florida would be saving most of the $2.29 a day it allots for their meals.

Prison labor — making license plates, picking up litter — is nothing new, and nearly all states have such programs. But these days, officials are expanding the practice to combat cuts in federal financing and dwindling tax revenue, using prisoners to paint vehicles, clean courthouses, sweep campsites and perform many other services done before the recession by private contractors or government employees.

In New Jersey, inmates on roadkill patrol clean deer carcasses from highways. Georgia inmates tend municipal graveyards. In Ohio, they paint their own cells. In California, prison officials hope to expand existing programs, including one in which wet-suit-clad inmates repair leaky public water tanks. There are no figures on how many prisoners have been enrolled in new or expanded programs nationwide, but experts in criminal justice have taken note of the increase.

“There’s special urgency in prisons these days,” said Martin F. Horn, a professor at John Jay College of Criminal Justice and a former commissioner of the New York City Department of Correction. “As state budgets get constricted, the public is looking for ways to offset the cost of imprisonment.”

Although inmate labor is helping budgets in many corners of state government, the savings are the largest in corrections departments themselves, which have cut billions of dollars in recent years and are under constant pressure to reduce the roughly $29,000 a year that it costs to incarcerate the average inmate in the United States.

Senator John Ensign, Republican of Nevada, introduced a bill last month to require all low-security prisoners to work 50 hours a week. Creating a national prison labor force has been a goal since he went to Congress in 1995, but it makes even more sense in this economy, he said.

“Think about how much it costs to incarcerate someone,” Mr. Ensign said. “Do we want them just sitting in prison, lifting weights, becoming violent and thinking about the next crime? Or do we want them having a little purpose in life and learning a skill?”

As reports emerged Thursday about deadly clashes between leader Moammar Gadhafi’s forces and anti-government protesters in the town of Zawiya near Tunisia, analysts highlighted how Gadhafi has already pledged to fight a rebellion to martyrdom.

Military intervention “is something which I hope doesn’t happen, but it looks as though at some point that it should happen,” said Simon Henderson, senior fellow at the Washington Institute for Near East Policy.

“What’s an acceptable number of civilian deaths? I don’t know. Choose your figure,” Henderson said. “At the very least, instead of having a casualty list certainly in the hundreds, possibly in the thousands, we don’t want a casualty list numbering in the tens of thousands, or 100,000 or so.”

After 10 days of protest, Gadhafi has lost control of the eastern portion of a country he has ruled for 42 years, and analysts portrayed him as a dictator desperately clinging to power. Members of his government have defected, and in a sign of growing international pressure, Switzerland ordered Thursday that Gadhafi’s assets be frozen.