Constable Hugh Robert Tait, who had reviewed the CCTV footage, told the hearing into the death of remand prisoner Jai Davis (30) the corrections facility log recorded five checks over about three hours until 10.38pm on Sunday, February 13, which were not shown on camera.
The footage showed the last recorded movement of Mr Davis was at 10.01pm that night, Const Tait told Otago Southland coroner David Crerar on the sixth day of the hearing.
Mr Davis was placed in an at-risk unit after he arrived at the prison on February 11 because he was suspected of having concealed drugs inside his body.
He was found dead in the unit about 5am on February 14.
As Mr Davis spent a lot of time with a blanket fully covering his body, there was easy opportunity for him to retrieve and consume drugs without being observed, Const Tait said.
In a written statement to the court, Dr Niranjan Sharma, who was working on contract to provide medical services to the corrections facility at the time of Mr Davis' death, said he should have been informed about Mr Davis' condition by nursing staff.
His symptoms, included high blood pressure and pulse rate, drowsiness, and itching and were considered serious enough to place Mr Davis on 15-minute observations.
If he had known dihydrocodeine and diazepam (Valium Valium) were involved, he would have requested the patient be taken to hospital.
Earlier yesterday, nurse Janice Lee Horne, who was on duty for shifts ending at 8pm on Saturday and Sunday that weekend, said she had treated Mr Davis on the basis that he had consumed cannabis, as she had no information he was suspected of having concealed prescription drugs.
She said it would have been her normal practice to visit a prisoner in the at-risk unit at least once a shift as part of her duties but said she did not recall her Saturday visit and did not have a written record of it.
There was no record of such a visit on the CCTV footage.
She said she had spoken to Mr Davis through the flap of the unit about 4pm on the Sunday after he complained about having blurry vision in his left eye.
When she asked him to come to the flap, she noticed he moved slowly, but was not staggering. He spoke slowly, but his speech was not slurred.
Ms Horne said for him to be roused every 15 minutes until 7.30pm and arranged to telephone the Corrections officer on duty at the unit at that time to check on these.
She said she duly telephoned and, finding out that nothing had changed and Mr Davis had responded to every rouse, she gave instructions that he should be verbally roused hourly overnight.
This would be in addition to visual observations through the cell flap at 15-minute intervals, which were carried out as a matter of course in the unit.
The rousing instruction did not appear to have been followed at all times.
Ms Horne said she had made her instruction clear but accepted she could have followed it up with an email.
She denied answering a call from the unit at 7.30pm saying she was not going over to see Mr Davis as she had ''already been there today''.
She also denied making derogatory comments about Mr Davis, as stated in evidence last week by nurse Sandra Lawrie.
She agreed she had made a statement to a detective, saying speaking about prisoners in a derogatory manner was part of the culture of working in the prison, but it was never done to the prisoners themselves.
It was a way of dealing with the stress of working in that environment and the humour could be ''quite black and crude''.
She agreed she had been spoken to by health unit manager Jill Thomson about the way she spoke about prisoners.
The hearing is expected to continue until tomorrow.
