51 vehicles were searched during the seven hour operation on Friday, 17 July 2020.
Small clip seal bags of white powder, suboxone strips and syringes were among the items seized.
Police are also investigating the discovery of more than 40 mobile phones in one visitor’s car.
The five visitors have now been banned from visiting Hakea for up to six months.
The Department of Justice, Corrective Services stepped up security with the lifting of the COVID-19 social visit suspension on 27 June 2020.
A search operation conducted at Hakea Prison on that day saw 16 matters referred to police, five people charged, the seizure of drugs and other contraband and eight visit bans.
Corrective Services Commissioner, Tony Hassall warned that visitors bringing banned items onto prison property face tough new penalties of up to 18 months imprisonment and or $12,000 fines.
“People who bring drugs and other harmful items into prisons put everyone at risk, from my staff to those people in our care,” Commissioner Hassall said.
In a separate operation at Bandyup Women’s Prison on Tuesday, 14 July 2020 it’s alleged a visitor was stopped at the gatehouse with a bag of white powder concealed inside his shoe.
A number of items including a baton, masks and unknown substances were also found in a vehicle.
The man has since been charged with possession of methylamphetamine and is due to appear in court on 11 August 2020.