Derbyshire Police have arrested four people on suspicion of possession with intent to supply class A and class B drugs in Grassmoor.
A spokesperson for Derbyshire Constabulary said: "Officers who executed a drugs warrant in Grassmoor have arrested four people on suspicion of possession with intent to supply.
"The warrant was carried out at an address on Wingerworth Street on Friday, February 27 at around 3pm.
"A substantial amount of what is believed to be Class A and Class B substances was seized.
"The two women and two men who were arrested have been released under investigation."