A 12-year-old boy is among three people arrested on suspicion of drug dealing in Mansfield.
Two further people were arrested for possession of drugs in the town on Wednesday.
All five have been released on bail.
Seized substances have been taken away for laboratory examination.
Inspector Steven Cooper said: "Any child is treated as much as a victim as a suspect in any offence like this.
"We will liaise with various agencies to try to get him some help."
"We have committed one day of action as well as an ongoing operation into the drugs problem in Mansfield.
"It will not stop there, we will continue until we remove drugs from the streets of Mansfield."