In Arizona, it's now legal for (most) adults to carry a concealed weapon without a permit. Republican Gov. Jan Brewer just signed the legislation, putting her state in the same camp as Alaska and Vermont.

The state had issued 154,000 permits under the old law, which required background checks and instruction. Gun buyers still face federal background checks when purchasing weapons from a store.

Here's more background about the legislation, which the state House passed last week.

(Posted by Michael Winter)