Forensic scientist Wong Koon-hung testified Thursday but his cross-examination was postponed when defense counsel took time off to review his recently provided case notes.

Wong, who is the ``instruments expert'' for the prosecution, said blue tape that secured the top of the carpet, which was wrapped around the body of Robert Kissel, came from the same bundle of tape found in the living room of the Kissels' Parkview apartment at Tai Tam.

Wong said the heavy metal ornament suspected of being the murder weapon weighed 3.71 kilograms and a ``significant force'' would have been required to deform its figurines and detach them from the base.

The jury trial of Nancy Kissel, 41, began June 7. She is accused of serving her husband a milkshake laced with sedatives, which is said to have left the Merrill Lynch investment banker unconscious at the foot of their bed.

She is alleged to have beaten him to death with the ornament on November 2, 2003.

The accused told a doctor and police at the time that her drunken husband had assaulted her after she refused him sex and then disappeared.

She denies the murder charge and is on bail.

The banker's decomposing body was found wrapped in a carpet in a storeroom at the Parkview residential complex November 7.

Last Monday, another government forensic expert testified bloodstain patterns found in the master bedroom led him to conclude the banker had been attacked on the floor without a struggle.

Lun Tze-shan said it was unlikely that an elongated weapon was used because he could not find any ``cast-off blood,'' which would have been left around the room as a result of the flinging action.

Under cross-examination Tuesday, Lun conceded that he ``failed to locate all blood stains that were present around the room,'' that he considered some other ``action'' might have taken place at the head of the bed and worried that the suspected crime scene had been tampered with before he conducted his blood stain pattern analysis.

Referring to photographs taken by police scientific officer Tam Chi-ching a day before Lun's inspection, senior counsel for the accused, Alexander King, pointed out blood spots on items in the opposite corner of the room.

King suggested that his conclusions were ``fundamentally flawed'' since he omitted blood stains from other areas of the room and that furniture had already been removed before he conducted his analysis.

Lun said he was unaware that furniture had been removed but maintained his conclusions were not flawed since he said it was ``likely'' the deceased offered no struggle at the end of the bed.

Last Wednesday, a television and chest of drawers, formerly situated at the foot of the Kissels' bed and said to have been splashed with blood, were displayed to the judge and jury.

Police officer Chan Kin-wah said the green rug which he had seized on November 12 seemed to be the same rug that the accused was shown to be carrying on CCTV footage.

The tag on the rug with its identification details concurred with those on a receipt from furniture store Tequila Kola, which shows that the accused had bought a four-foot by six-foot green rug.

Pang Chi-ming, the prosecution's DNA expert, testified Thursday that samples of blood and DNA on the base of the heavy metal ornament ``probably'' belonged to the deceased, with a one in 429 billion chance that it belonged to someone else.

He testified Friday that samples of DNA from blood on the heads of the figurines possibly came from both the deceased and the accused.

The case continues today before Justice Michael Lunn.