Police seized about £10,000 in cash from a property in Keighley on the last day of a major crime crackdown.
Operation Viper officers raided a property in Black Hill Lane, Braithwaite. Cash was found hidden in a bedroom and bathroom.
A 25-year-old man was arrested at the scene on suspicion of money laundering.
Officers last week targeted prolific and persistant offenders in the district.
During the five days of action, 31 people were arrested and 97 premises visited. Six vehicles were seized, along with a number of weapons, including tasers, crossbows, swords and knuckledusters. Officers also found and dismantled three cannabis farms.
Chief Superintendent Dickie Whitehead said: “The targeted operation took the fight right to the doors of some of the most prolific offenders operating in the district.”