A number of uniformed officers carried out patrols in a bid to increase their visibility in drug hot spots.
Exeter City Council's environmental health officers and Julian House's outreach team, were also involved.
Police say they are trying to reduce the number of needles being left on the ground by giving out safer, single use injection needles.
Three arrested after unrest in Plymouth
Man stabbed with a screw driver
They want to stop massive installation
"Shocking act of violence" say police
Photo released after Plymouth sex assault
Plymouth police are appealing for the public's help in tracing a person of interest following a sexual assault in the city on Friday.
Funding crisis causes closures
Five teenagers arrested after North Devon fire
Murder investigation underway
