From NPR News, this is ALL THINGS CONSIDERED. I'm Robert Siegel.
AUDIE CORNISH, HOST:
And I'm Audie Cornish.
Mysterious new developments in Mississippi today in the case of poisoned letters sent to President Obama, a U.S. Senator and a Mississippi judge. Federal authorities are dropping charges against a man arrested last week in connection with the case.
NPR's Debbie Elliott has an update for us. And, Debbie, to start, the initial suspect, Paul Kevin Curtis, is actually free tonight. What happened in this case?
As Congress continues its debate over immigration reform, nearly a half-million young people who are in the U.S. illegally have already applied for deferred action.
The Obama administration started the policy, formally known as Deferred Action for Childhood Arrivals, last year for people who were brought into the U.S. illegally as children. Those who are approved gain the right to work or study and avoid deportation for two years.
The U.S. Supreme Court has ruled that a longtime legal resident of the United States was improperly deported for possession of a small amount of marijuana. By a 7-2 vote, the justices said that it defies common sense to treat an offense like this as an "aggravated felony" justifying mandatory deportation.
As investigators look into the Boston Marathon bombings, one crucial question is whether the suspects, brothers Tamerlan and Dzhokhar Tsarnaev, acted alone or had help. The clues might be found in the bombs used.
From what is now known, it appears the brothers assembled a whole arsenal of explosives. Watertown Police Chief Edward Deveau told CNN last weekend that the suspects had at least six bombs, including the two used in the attack and one thrown at police during a shootout.
More online retailers would have to collect sales tax under a bill making its way through the U.S. Senate this week. The measure won strong bipartisan backing on a procedural vote Monday, and President Obama has said he would sign it.
The political battle over the bill pits online retailers against brick-and-mortar stores — and, in some cases, against other online sellers.