Up to 375,000 registered gun owners in Arizona and Tennessee were today given the right to carry concealed guns into bars and restaurants that serve alcohol, in the latest example of loosening gun laws in a country already renowned for its lax approach to firearms.

The change of the two states' gun laws marks a trend across the US towards increased rights for gun owners despite a spate of bloody rampages in recent months that have seen scores of Americans die. Advocates of the second amendment's right to bear arms argue that in the wake such shooting sprees, citizens should be able to defend themselves by carrying guns in public places.

But opponents say this is the logic of the mad house...

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