The law on keys vs. combination locks: “[T]he law has always drawn a distinction between objects and what’s in your brain. And even though the key to a lock and a series of numbers that’s the combination to a combination lock are functionally the same thing, the law draws a distinction and says that under the Fifth Amendment you can’t be compelled to disclose what’s in your brain if it’s going to hurt you.” More on this fascinating segment of “On the Media” with NYT reporter Adam Liptak and host Bob Garfield.