Police have arrested a man on suspicion of trafficking dangerous drugs after finding more than 100 kilogrammes of cannabis buds at a flat in Sheung Shui.

The man, 28, was stopped by officers on Monday evening while allegedly carrying a kilogramme of cannabis buds.

More of the drug was discovered during a subsequent flat search, along with more than 650 etomidate cartridges.

Police said the haul had a street value of more than HK$20 million.

The man is expected to appear in court in Fanling on Wednesday.

"The force would like to remind all citizens that etomidate was listed as a dangerous drug in mid-February last year. Selling etomidate, just like selling cannabis buds, is a form of drug trafficking and it is a serious offence," said inspector Ng Ka-wai.

"According to the law, one could face up to a HK$5 million fine and life imprisonment upon conviction."