Drug reimportation is back on the table, being pushed this time by David Vitter, a Louisiana Republican who ought to know better. Grace Marie-Turner attacks the scheme on the grounds of safety, which could be valid (I don’t know), but the knock-down argument against it is economic.
The short version of the argument is that we cannot realize real savings by shipping a product to Canada and back. The long version is here, the upshot of which is that reimportation would screw Canada over without accruing any discernible benefit to us.