"We still encounter people who are either naive about the risks or unrealistic.
"They underestimate how quickly word goes around and how quickly things can go really bad.
"People drinking to excess is still a problem and that's the biggest area for improvement."
Mr Horne said adults needed to get more responsible and stop treating teenagers as adults.
On Friday, police officers carried out Operation Presence, a monthly campaign designed to focus on different aspects of offending. Last month, as well as alcohol-related issues, there was also a family violence phase.
Operation Presence involved controlled purchase operations at off-licences. None of the premises sold alcohol to minors, Mr Horne said.
The booze bus was also out with stops set up across the city.
A number of people were over or close to the drink-drive limit, he sad.
"I was on the front line myself and there were lots of people asking how much they could drink before they go over.
"The best advice is to just not to drink." The family violence aspect involved members of police staff visiting at-risk people to make sure the plans they had in place were working, offering reassurances and encouragement.
Operation Presence
* A monthly operation involving most police staff, including non-sworn
* Different focus each month
* August's focus was alcohol-related offending and family violence
* Operation involved breath-testing, controlled purchase operations and home visits
* Level of compliance was good, according to the area commander
