With the stroke of Gov. Jared Polis’ reluctant pen, Colorado this month became the first U.S. state to pass a law expressly regulating the use of artificial intelligence — a milestone that supporters said was an imperfect starting point to establish oversight of an emerging industry. The state’s new law broadly targets the risk of discrimination when companies use AI, while requiring basic levels of transparency. “I think Colorado’s AI act is a major shift in the approach to AI oversight in the United States,” said Duane Pozza, a Washington, D.C.-based lawyer who specializes in emerging technology and artificial intelligence.