A man died in a police cell while three custody officers watched a video of a Disney cartoon, a court has heard.
Craig Boyd, 32, hanged himself at the St Mary's Wharf station, Derby on 16 March, 2004, the court was told.
Nigel Rogers, 42, Christopher Linscott, 43, and David Stoll, 49, all deny at Nottingham Crown Court a charge of misconduct in a public office.
The trial was told the three officers did not check the prisoners in their care for more than three hours.
The court heard the officers were watching Disney's Finding Nemo cartoon when the prisoner died.
Greater Manchester Police and the Independent Police Complaints Commission investigated his death.
Andrew Robertson QC, prosecuting, said the three officers were guilty of a "gross dereliction of duty" in failing to notice Mr Boyd was a suicide risk.
"He had hanged himself and it is the Crown's submission that he was a suicide risk, but no proper assessment of that risk had been carried out.
"The officers were hardly rushed off their feet carrying out their duties. It was a quiet night and in our submission there can be no excuse for these officers not carrying out their duties," he said.
The court was told David Stoll had falsified records in the custody log to show he had visited the cells when he had not.
Mr Robertson said Mr Linscott and Mr Rogers should have been making sure he carried out the checks.
The trial is expected to last three weeks.