1.   Early one recent morning, a crew of prisoners in blue jeans marched along a road carrying sling blades over their shoulders.

2.   While crimes involving knives have gone up, children caught carrying open blades are usually just sent home with a caution.

3.   Federal officials have banned passengers from carrying small blades, including boxcutters.

4.   U.S. officials have banned passengers from carrying small blades, including box cutters.

5.   U.S. officials have banned passengers from carrying small blades on flights since the September attacks.