According to their original guidelines, anyone who enters the state must quarantine for 14 days. It does not matter if you have quarantined in another state, you still have to do it here.
But, with no way to track who is where, it is on the honor system. But someone can come from a hot spot within the state and have no limitations.
If you are sick, stay home. If you have been around someone who has been sick, stay home. If you have or are around someone with a compromized immune system, stay home. Simple.