More than 140 bags of cannabis were found at a house in Great Horton as part of a crime crackdown in Bradford.
The discovery was made when officers, working under Operation Viper, raided a semi-detached property on Sundown Avenue.
They found 147 separately packed bags of the class B drug in the front bedroom of the house.
Three men aged 22, 21 and 18 were arrested on suspicion of possession with intent to supply class B drugs. The 21-year-old has been released on bail while the investigation continues. The other men have been released without charge.
Three other men were also arrested as part of separate investigations into the theft of items from vehicles, a domestic sexual assault and breach of a court order – all part of Operation Viper.
Over three days, 21 people have been arrested and more than 50 different addresses entered and searched.