Express Scripts is PBM,and a HUGE company.
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Express Scripts can do it only because they've greased the right palms to allow the trade which costs, of course, must be passed on to the consumer while still saving them money and allowing our glorious government to claim that reverse importation is legal.
When Bernie Saunders was still just a mere Senator from Vermont, he led a bus excursion loaded with Vermont seniors over the border to Canada to fill some scripts which they were legally allowed to bring back as personal use.
The purpose of this excercise was, of course, to show how socialized medicine in Canada was superior to the U.S. model.
How practical is such a day trip to Canada for most of Americans?