A first-of-its-kind law in New York could force 3D printers sold for homes and business to come equipped with technology blocking them from making guns.
The new requirement, also under consideration in California, attempts to thwart the latest technique for producing untraceable "ghost guns" that have turned up in crimes. But there are questions about whether the technology can work and concerns about its affect on personal privacy and constitutional rights.
About one-third of U.S. states already have taken steps to ban or regulate build-it-yourself firearms that lack serial numbers and evade the background checks required to purchase guns from federally licensed dealers. What makes the new effort unique is that it targets the equipment used to produce the firearms, not the people who make them.
