Watch out for ink!

Argentina is banning book imports. Well, they deny they are banning books, but... "The government claims that this is not a ban. However, since each buyer has to demonstrate at the airport’s customs office that the ink in the purchased book has lead quantities no higher than 0.006% in its chemical composition, the result is that all book imports into the country are stalled."
But it is not just books they are after:  Sniffing dogs are being deployed at airports and border check points to detect the ink used to print U.S. bills, so Argentines cannot take out of the country more than $10,000 without declaring it to the government.
 http://www.cato-at-liberty.org/argentina-bans-book-imports-due-to-human-health-concerns/