It was discovered during a number a searches on Thursday night.
Officers and student officers attended a number of incidents, including 3 domestic ones.
Knuckle dusters are banned from being imported, made or sold in the UK.
It is also a crime to carry such a weapon in a public place.
Devonport dockyard is out of 'special measures'
Safety improves after 12 years of 'enhanced attention'
Duke of Cornwall visits Cornwall
VIDEO Prince William makes pasties
Torbay Airshow brought £5 million to local businesses last year
Council put in £100,000
Robbery investigation underway in Plymouth
Man suffered multiple facial fractures
Man seriously injured in Axminster collision
A car and motorbike collided
