Cheng Kok-choi, for the prosecution, testified that in 10 years as a toxicologist he had never encountered the mix of anti-depressants, hypnotics and sedatives found in the banker's body.

``Not even in suicide cases involving multiple drugs,'' he said.

Cheng received samples from the stomach and the liver of the deceased November 8, 2003, a day after Lau Ming-fai carried out the post-mortem.

The drugs found in the body included ``date rape'' drug Rohypnol and sedative Lorivan, both allegedly prescribed for Nancy Kissel in the weeks leading up to the murder.

Nancy Kissel, 41, is accused of serving her husband a spiked pink milkshake and beating him to death with a heavy metal ornament as he lay unconscious at the foot of the bed November 2, 2003.

She told a doctor and the police her husband was drunk and assaulted her after she refused him sex, and that he then disappeared. The banker's decomposing body was discovered in a storeroom in the Parkview residential complex in the early hours of November 7. Kissel denies the charge and is out on bail.

Cheng said Monday he also tested Robert Kissel's alcohol level and found it to be ``insignificantly low.''

He said the level was 100th the strength of beer.

Earlier in the trial, Senior Assistant Director of Public Prosecutions Peter Chapman read out the testimonies of a doctor and nurse in private practice who said they prescribed 10 Rohypnol tablets to Nancy Kissel on October 23.

Police seized several bottles of tablets or syrups from the Kissel residence. In a bottle labelled ``Advil,'' Cheng found six tablets containing Paracetamol and 11tablets of an anti-inflammatory drug, Ibuprofen.

Cheng said two bottles of tablets, which seemed to have been prescribed by the same doctor, contained the same type of Paracetamol tablets.

One bottle contained 20 tablets and seemed to have been dispensed November 4, 2003.

Other bottles contained either cough syrups, allergy tablets, slimming pills or plain water, Cheng said. Earlier Monday, Alexander King, senior counsel for the accused, placed data before the government computer expert to show that between August and October 2003, when the Kissel children were back in Hong Kong, the family's Dell home computer was used to view the Hong Kong International School Web site and search for Halloween costumes and Barbie dolls.

Last week, the court heard the same computer was used to search for gay sex sites when the family was out of town and Robert Kissel was home alone.

In re-examination, government computer forensic expert Cheung Chun-kit said the bulk of the Web pages produced by the defense were Google results pages and agreed with Chapman who suggested ``there's nothing to suggest in that bundle that the user has gone beyond'' those pages.

Chapman noted the recreated porn Web sites appeared to be only the ``home page'' or the ``front page.''

Cheng agreed there was also nothing to suggest the user had bookmarked gay porn sites or paid for entry to porn sites. He noted that words such as ``gay ultra'' were searched for by the user of the Encase software to examine the computer's hard drive, and not by the computer user surfing the Internet.

The case continues before Justice Michael Lunn.

albert.wong@singtaonewscorp.com