The policemen are accused of carrying out illegal raids in which they confiscated the items, Corriere della Sera reported on Friday.
The three were snared after being reported by a Moroccan man they targetted, who was accused of dealing heroin and then acquitted. The unreported police raids are thought to have been carried out against a number of other immigrants for over a year, Corriere said.
In subsequent raids on the policemen’s houses, investigators found gold jewellery, shotgun cartridges, cocaine and more than €40,000 in cash.
The policemen have been taken into custody, accused of criminal association, embezzlement and drug dealing, while two of their colleagues remain under investigation.