A federal judge in Denver found Tuesday that federal immigration authorities have routinely carried out illegal arrests in Colorado and ordered them to better document detentions so their legality can be monitored.

The 66-page decision from U.S. District Court Judge R. Brooke Jackson came three weeks after four immigrants testified that U.S. Immigration and Customs Enforcement agents had arrested them without warrants and without first checking to see whether they were likely to flee court proceedings — a check that’s required by law.

Jackson ordered Tuesday that ICE remove the ankle monitors on three of those people, one of whom is a Univerity of Utah student arrested in Mesa County in June, and refund the bail that each paid to leave detention earlier this year. (The fourth immigrant h

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