 On May 29, 2019, Polis signed House Bill 1124 immediately prohibiting law enforcement officials in Colorado from holding undocumented immigrants solely on the basis of a request from U.S. Immigration and Customs Enforcement.In May 2014, Polis became the first U.S. representative to accept campaign donations via Bitcoin.In 2014, Polis sponsored two ballot measures targeting hydraulic fracturing, Initiatives 88 and 89.