Why are butterfly knives illegal?

Related questions

1. What is kept in a sporran?
2. Why do sporrans have 3 tassels?
3. Can you wear a kilt without a sporran?
4. Who wore kilts first?
5. What are the main clans of Scotland?
6. Did the English wear kilts?
7. Who can wear a tartan?
8. Should you wear pants under a kilt?
9. Does craigh na dun exist?
10. What is Dirk short for?

Tags

1. #public
2. #transport
3. #states
4. #possess
5. #carry
6. #united
7. #switchblade
8. #jurisdictions
9. #illegal
10. #certain
11. #butterfly
12. #categorized
13. #transfer
14. #manufacture
15. #gravity
16. #dagger
17. #balisongs
18. #knife
19. #balisong
20. #hawaii