Six years ago, the FBI took on a challenge: To review what it called cold-case killings from the civil rights era. The investigation into 112 cases from the 1950s and 1960s is winding down, and civil rights activists are weighing the FBI's efforts.

The review comes with word this week of the death of a man who'd been named, by a newspaper investigation, as a possible suspect in one notorious case.

The Case

NPR's Ari Shapiro joins host Scott Simon to talk about the Obama administration's week. The president was buffeted by revelations that the IRS had targeted Tea Party groups seeking tax-exempt status and that the Justice Department had subpoenaed reporter phone records. On top of that, Republicans continue to allege that the White House engaged in a cover-up of talking points about the attack in Benghazi, Libya.

Host Scott Simon talks to ESPN's Howard Bryant about the NBA playoffs, Washington Nationals outfielder Bryce Harper's collision with a wall, and David Beckham's retirement from soccer.

This week, the National Transportation Safety Board recommended lowering the legal limit of blood alcohol content for drivers to .05 or even lower. Currently, it's illegal to drive in all states with a BAC of .08 or higher. Host Scott Simon speaks with Dr. Anthony Liguori of Wake Forest School of Medicine about alcohol's impact on driving ability.

For years, reports have suggested that Afghanistan is sitting on massive deposits of copper, gold, iron and rare earth minerals valued up to $3 trillion. This provides hope for a future economy that would not have to rely so heavily on foreign donations.

But with an uncertain political, regulatory and security environment, international investors are hesitant. And it could be many years before Afghanistan begins extracting its mineral wealth.

It's been a long slog already for the bipartisan immigration overhaul proposed by the Senate's Gang of Eight.

The legislation has been the target of more than 300 amendments during days of debate and votes by the Senate Judiciary Committee. But while the bill has largely held its own so far, its prospects for getting through Congress remain uncertain.

In Judiciary Committee Chairman Patrick Leahy's view, the immigration overhaul is "moving very well."

"It's moving a lot faster than people said it would," says Leahy, a Vermont Democrat.

In the seven years since her last album, Audra McDonald has kept busy. She spent several years in Hollywood, filming the television series Private Practice. She's gotten divorced and remarried, absorbed the shock of losing her father in a plane crash and watched her daughter, Zoe, grow up from a kindergartener to a middle-schooler.

France is officially the 14th country to legalize gay marriage. Saturday, President Francois Hollande signed a bill that Parliament had passed in April, which gives same-sex couples the right to marry and adopt.

Two Metro-North Railroad trains have collided on a stretch of track near Fairfield, Conn., causing a "major derailment" and "preliminary reports of injuries," according to the Metropolitan Transportation Authority.

[Update at 8:55 p.m. ET: The Associated Press quotes Connecticut officials as saying about 50 people have been hurt, four of them seriously.]

According to The Hartford Courant:

Of all the controversies swirling around the Obama White House, the Internal Revenue Service scandal seems likeliest to have the longest shelf life.

While the Benghazi affair has long been in the news, it's never really taken off as an issue beyond the Republican base.