Less than 2 per cent of the prisoner population tested positive for drugs, which was lower than the national average, he said.
Comparing prisons in respect of contraband was difficult because each had its own particular factors, including location, design, layout, prisoner status, arrival volumes, prisoner numbers and transit from courts.
"For example, some prison perimeter fences are close to public roads and prisoners' associates may attempt throw-overs," Mr Harrison said.
"Unfortunately, some prisoners will constantly try to find ways to challenge the system and attempt new ways to introduce contraband into prison, so our staff must try to stay ahead of them.
"The department's operational intelligence unit works closely with front-line Corrections staff to identify and analyse trends in contraband.
"We then use this information to help prevent contraband entering prison and to improve prison security."
Between December 1, 2009 and December 31, 2012 warnings about contraband at the prison were given to 45 people and 75 items were confiscated.
In that time a total of 854 items, listed under 43 contraband categories, were discovered at the prison.
Drugs included amphetamine and methamphetamine (six), as well as cannabis leaf, cannabis oil and cannabinoids (50).
There were 96 items listed under "drug indication", four of drug storage, one as "powder other", 14 listed as pills/tablets/capsules and 13 as prescription medicine.
Also discovered were items of pornography (four), cellphones (six), commercial alcohol (five), home brew and its ingredients (15), improvised weapons (27), gang paraphernalia (26), and tattooing equipment, including needles and ink (123).
Three needles and 41 smoking devices were listed separately to the 14 tattoo needles and 168 items under ''tobacco and smoking equipment''.
A club/baton was listed, as well as a firearm and four knives.
Under "modified equipment" were 28 items, and there were four cases of contraband money.
Also listed was a network device, three sim cards, a phone charger, 17 "stockpiled goods", one "throwover" and four items of "T-Bomb", a testosterone-enhancing substance.
Mr Harrison said those involved in attempting to smuggle contraband into jail faced disciplinary action from Corrections staff and/or police.
"Prisoners often place pressure on family or friends to bring them contraband. However, we make it very clear that anyone caught doing this will face consequences for their actions.
"The security of our facilities is paramount and working to detect drugs and other contraband before they enter our facilities is at the forefront of our efforts every day."
