WASHINGTON (AP) — The Food and Drug Administration has ordered Google-backed genetic test maker 23andMe to halt sales of its personalized DNA test kits, saying the company has failed to show that the technology is supported by science. In a warning letter posted online Monday, FDA regulators say that the Silicon Valley company has not shown that its tests are safe or effective despite "more than 14 face-to-face and teleconference meetings" and "hundreds of email exchanges." The agency orders 23andMe to stop marketing its test immediately, warning that erroneous results could cause customers to seek unnecessary or ineffective medical care.