The Colorado attorney general is suing a sheriff's deputy for his role in the detention last month of a University of Utah student by federal immigration officials.

Atty. Gen. Phil Weiser also disclosed that his office is investigating whether other law enforcement officers on a regional drug task force the deputy worked on have been sharing information to help federal agents make immigration arrests.

Phil Weiser lawsuit cites Colorado law limiting the authority of state agencies and employees to cooperate with federal immigration officials.