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A new method of obtaining organs for transplantation is raising a host of ethical questions, including whether the donors are technically "dead."

For decades, organ donation has been guided by something called the "dead donor rule."

"We have this idea that you must be dead first — so before your organs can be removed, we agree that you are dead," said Leslie Whetstine, a bioethicist at Walsh University in Ohio.

Good morning.

Our early headlines:

-- Reports: Police Pursued Manslaughter Charge In Trayvon Martin's Death.

-- Gingrich Slashes Staff, Pins Hopes On GOP Delegates Turning To Him.

"I grabbed his arm and put him in a choke hold. ... I'm just happy I was able to get him down to the floor."

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RENEE MONTAGNE, HOST:

On the third and final day of Supreme Court arguments over the constitutionality of the health care overhaul law enacted in 2010, the focus turns to whether the law could survive if the justices decide to strike its most controversial component — the so-called mandate that "requires most Americans to either have health insurance starting in 2014 or pay a penalty," NPR's Julie Rovner reports.

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DAVID GREENE, HOST:

As he slashes his campaign schedule and lays off about one-third of his staff, 2012 Republican presidential Newt Gingrich is mounting a "big-choice convention strategy" that he hopes will end with Republicans turning to him to be their nominee, NPR's Don Gonyea tells our Newscast Desk.

Comedian Bill Maher's $1 million check to the superPAC supporting President Obama's re-election is the first seven-figure donation to the group since Obama tacitly endorsed the fundraising strategy in early February.

And it has brought new focus to some of Maher's statements about women — specifically Republican women — and led to calls for the White House to disavow the HBO host and his money.