The prosecution's star witness underwent a withering cross-examination on Thursday at Roger Clemens' perjury trial. Clemens, a seven-time Cy Young Award winner, is charged with lying to Congress when he testified that he never used performance-enhancing drugs. Brian McNamee, his one-time trainer, is the only witness who has firsthand evidence that contradicts the baseball-pitching ace.

Earlier this week, guided by the prosecution, McNamee testified in agonizing and repetitive detail about how he injected Clemens with steroids and human growth hormone between 1998 and 2001.

From WHYY

A new law in Pennsylvania has doctors nervous.

The law grants physicians access to information about trade-secret chemicals used in natural gas drilling. Doctors say they need to know what's in those formulas in order to treat patients who may have been exposed to the chemicals.

But the new law also says that doctors can't tell anyone else — not even other doctors — what's in those formulas. It's being called the "doctor gag rule."

'I Don't Know If It's Due To Exposure'

A huge trove of documents has been released by prosecutors in the Trayvon Martin case. Among the biggest revelations so far is that the autopsy reveals Martin had THC in his system. But police said the shooting was "ultimately avoidable."

ABC News, which is digging through the documents, reports:

"The autopsy report shows traces of the drug THC, which is found in marijuana, in Martin's blood and urine.

Several news outlets are reporting that computer giant Hewlett-Packard will announce the elimination of 25,000 to 30,000 jobs. All Things D reports that the announcement will come from CEO Meg Whitman when the company announces its quarterly earnings next Wednesday.

All Things D reports:

When Facebook makes its initial public offering Friday on the NASDAQ, the stock will be priced at $38 per share, a price that's expected to bring in between $16 billion and $18.4 billion to the company. CNBC reports:

"[The price makes] it one of the most lucrative offerings the Street has ever seen. With that valuation taken into consideration, Facebook goes public with the highest valuation — in the $100 billion range — of any company on record at the time of its IPO."

Sgt. J.P. Huling, a Marine from Ohio, was killed this month in southern Afghanistan.

It wasn't a roadside bomb or a Taliban sniper that killed him. It was another sergeant — an Afghan soldier known as Sgt. Zabitollah, who like many Afghans went by one name.

It was a grim coincidence that brought these two sergeants together on May 6, a Sunday afternoon, at a mud-walled compound along a desolate stretch of road in a remote corner of Afghanistan.

Battleground states like North Carolina are where the action is when it comes to presidential contests. Thus, they are where political tactics like, say, the anti-Obama ad campaign featuring the Rev. Jeremiah Wright, first reported by The New York Times Thursday (and now disowned by virtually everyone the Times linked to it), are most likely to be rolled out.

We've heard from Alt. Latino co-host Felix Contreras in the past, but here we'll hear from the show's other half, Jasmine Garsd. Garsd was raised in Buenos Aires and connected with the Argentine rock scene in her teens. She moved to the U.S.