There is now an effort to loosen knife laws.

From The Atlantic:

The similarity to the gun lobby isn’t accidental. The most influential organization dedicated to knife rights is patterned after the National Rifle Association, although it doesn’t nearly have that group’s legislative firepower. But the movement is also a recognition that, as gun advocates score victory after victory at the state level (the Georgia Legislature this week passed a bill that would allow guns to be carried in bars, schools, churches, and airports), the political environment has never been better for loosening similar restrictions on knives.