Recidivist offenders have been targeted by Tasmania Police in a northern suburb lockdown on Wednesday.
Ravenswood was locked down while random breath tests, oral fluid tests and vehicle searches were conducted.
Police officers involved in Operation Orca, previously known as Operation Raptor, also conducted search warrants in the area.
Nearly 600 breath tests were conducted, with two drivers detected with illicit drugs in their system.
Two people were charged with unlawful possessions, with two stolen items recovered.
Four people were arrested due to failing to appear warrants.
Two people were charged with firearms offences and one person was charged in relation to a family violence investigation.
Ravenswood was the second suburb to be locked down as part of the ongoing operation.
MORE ON NORTHERN SUBURBS POLICE OPERATIONS:
Mayfield was targeted in May with police executing warrants, searching vehicles and conducting random breath tests.
Of the 450 random breath tests conducted, police caught six drug-drivers, two disqualified drivers and one drink-driver.
Tasmania Police Acting Sergeant Aziz Melick said 20 members from Northern Road and Public Order Services, uniform, CIB, and the 10-strong Operation Orca taskforce as well as several police dogs took part in Wednesday's crackdown.
"By arresting and closely monitoring recidivist offenders the Operation Orca taskforce is trying to make life as uncomfortable as we possibly can for them," he said.
"Our taskforce members monitor our most prolific recidivist offenders closely to hold them to account.
Prior to the Ravenswood crackdown, the operation had arrested or charged 145 people with more than 640 charges laid, seized 13 firearms, and clamped or confiscated 11 motor vehicles.