Five people were arrested by police in Paceville on Friday night after they were found in possession of the drug known as Meow Meow.
The drug, technically known as mephedrone, has been illegal for the past three months.
Those found in possession of the drug in Paceville are aged between 17 and 25 and live in Fgura, Luqa, Valletta, Żabbar and Mosta. They are expected to be charged in the coming days.