In response to the Judith Miller/Matt Cooper/Valerie Plame imbroglio, Reason editor Nick Gillespie argues against a national shield law for reporters:

But why not champion a new federal shield law and more state-level ones? As my Reason colleague Matt Welch, who generally supports such legislation, has pointed out, all sorts of non-journalistic types are shielded, too, including doctors, lawyers, spouses, and more.
But there’s the rub: Shield laws, in the end, confer on government the effective right to license the press