Police arrested a woman and seized a quantity of suspected drugs thanks to tip-offs from members of the public.
Officers raided a house in Vernon Road, Aylestone, Leicester, on Thursday.
A 23-year-old woman was arrested and what officers believe to be class A drugs were recovered when the house was searched.
The raid was conducted by officers from Welford Road police station with a warrant granted under the Misuse of Drugs Act.
Leicestershire Police said there had been a number of complaints about alleged drug activity in the area. The arrested woman has been released on bail as officers continue their inquiry.
Inspector Richard Toone said: "We have had a number of calls from members of the public in relation to issues of anti-social behaviour, particularly relating to the use of drugs, and it's from that information we acted.
"We will continue to work with our communities to reduce crime and anti-social behaviour and would urge anyone who has information to get in touch. Please don't hesitate to call us."
Information about drugs misuse can be reported to police on 101 or anonymously, via Crimestoppers, on 0800 555 111.