HEROIN worth £1,000 was seized when police carried out a warrant in Mexborough.
The drugs were seized from an address in Oliver Street on Thursday morning.
In a separate raid, a 27-year-old man, of Wood Street, was arrested on suspicion of possessing class B drugs.
Det Chief Insp Paul Wilson said: “Members of the Mexborough community have told us that they feel very concerned about the level of drug-related crime that takes place locally.
“In 2018, we made it a priority to disrupt this activity and had great success. We will continue this approach in 2019 and have a range of plans in place to target those who believe they are above the law.
“Our message to them is that we know who you are, we will find you and you will be dealt with using the full force of the criminal justice system.”
DCI Wilson urged anyone living in Mexborough with concerns to report them via the local neighbourhood policing team by calling 101, or anonymously to Crimestoppers on 0800 555111.
He added: “A key focus for the Doncaster policing team is preventing organised crime by bringing offenders to justice, protecting vulnerable people and increasing community resilience to organised crime.
“We’re committed to building long-term community relationships and increasing the confidence those who live and work in the areas we serve have in us.
“We can only do this with the support of the community and look forward to working together over the next 12 months and beyond.”