No children's books printed before 1985 allowed to be distributed

This sounds like the soft totalitarian or at best bureaucratic version of book burning.

Book Dealers Told to Get the Lead Out

Legislation passed by Congress last August in response to fears of lead-tainted toys imported from China became effective last month.

Under it there is a ban on distributing children's books printed before 1985
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Lead was phased out of printer's ink following the 1978 paint ban; lacking a firm date for when it effectively disappeared, the safety commission has ruled that the toxic metal might be found in any book printed before 1985.
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Implementation of the new law has libraries and secondhand bookstores reeling. Although they could pay to have each old book tested, the cost ($300 to $600 a book,  according to the American Library Association) makes that impractical.
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The commission has advised libraries not to circulate old books while the agency reviews the situation. But few libraries have complied, and they complain that they have received contradictory information from the commission.

"We're talking about tens of millions of books," said Emily Sheketoff, executive director of the Washington office of the American Library Association. "You've got the commission playing games with the libraries.

The legislation is the Consumer Products Safety Improvement Act of CPSIA

Here's a site that explains the law and a blog that tracks efforts to amend the law.