I think that it is only safe (legal?) to transport ash across state lines if it has been properly kiln dried. Some places that have major infestations of EAB, it may not be legal to transport any ash across even county lines unless it has been properly treated beforehand.
I see that radial pattern quite often under the bark of small logs I pickup for turning blanks and leave on my driveway. Most were green when I collected them and I am pretty sure that the beetles attacked it after I collected it.
--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.