What is the only u. s. state without a mandatory seat belt law for adults?

I believe the answer would be; New Hampshire.

-Hope this helps! :)

The only State in the United States without a seatbelt law is New Hampshire.

New Hampshire's motto is "Live Free or Die"

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.

answer; the government can clearly justify the restriction;