Ok, what did you bring to the Eagle Creek hike some years ago? If that got through, probably whatever you're taking to the JMT will go through. No guaranttes (especially from this ignorant granny), but it might be an indication. Monday my daughter, her husband and I, went back and forth between Oregon and California several times (including one road right on the state line) with no inspection at all--for whatever that info is worth.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey