Parents will significantly increase DNA testing on embyros to screen for faulty genes over the next decade, potentially in search of designer babies, a researcher predicts in the journal Nature. David Goldstein of Duke University told The Times of London that better science may allow parents to screen for all kinds of things previously unknowable. “We should think about an appropriate dividing line. Most people are in favor of allowing this when a disease is severe, but are more uncomfortable with marginal disease risks. It’s something we are going to have to think hard about," Goldstein said.