According to The Daily Signal:
From the beginning of 2015 through last March, the Denver Sheriff Department went on a major hiring binge, adding more than 200 new deputies. But those jobs ended up only going to citizens, because the department made citizenship a stated requirement on the job application. The department admitted as much in a new settlement with the U.S. government, which requires it to pay a $10,000 fine.
The department will also have to comb through all of its job applications from the past two years, identifying immigrants who were excluded from the hiring process and giving them due consideration.