POLICE have seized a large stash of drugs and cash in Linthwaite.
Three men and a woman were arrested after police swooped on four homes on Tuesday.
The arrested - two men aged 28, a 24-year-old man and a 27-year-old woman - were questioned at Huddersfield police station and released on police bail.
Tests are being carried out on the substance, believed to be heroin.
The four were arrested on suspicion of possession with intent to supply class A drugs.
Detectives have again urged people to keep calling the Dob In A Dealer hotline to tip police off about suspected drug dealers.
Acting Det Insp Mick Turner, of Kirklees District Drugs Team, said: "Our campaign has been helped by calls to our Dob In A Dealer hotline by local people.
"We have acted on their information and the team has been on the streets every day to try make sure known dealers are identified and rigorously prosecuted."
Call Dob In A Dealer anonymously on 0800 555 111.