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"Four International Security Assistance Force service members were killed today in eastern Afghanistan by a member of the Afghan National Army," the NATO-led military command in Kabul reports.

While others analyze what Thursday's GOP presidential debate does or doesn't tell us about what may or may not happen Saturday when South Carolina Republicans hold their primary, here's the top news from that four-man clash in Charleston:

The Florida Department of Law Enforcement faced accusations that a breathalyzer was giving inaccurate readings. So it commissioned a study. Fifteen employees consumed more than $300 worth of whiskey, mixers and Doritos, and then used the breathalyzer. Judges are considering whether the study was legitimate.

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RENEE MONTAGNE, HOST:

(POST-BROADCAST CLARIFICATION: This story takes place in London, Ontario.] Good morning. I'm Renee Montagne. Londoners hoping to avoid jury duty ought not to walk too close to the courthouse. A frustrated judge there recently exercised a little-known power: sending police into the street to rustle up jurors.

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DAVID GREENE, HOST:

This is MORNING EDITION, from NPR News. Good morning. I'm David Greene.

RENEE MONTAGNE, HOST:

And I'm Renee Montagne.

We're waking up on a morning before a key Republican primary in South Carolina, and after a day when the field of Republican candidates went up, down, and up again. Rick Perry went down and bowed out of the race. Newt Gingrich rode a surge in the polls. And Rick Santorum went up, when it was revealed that he got the most votes in the Iowa caucuses, not Mitt Romney.