An operation was launched to crack-down on the number of drugs entering Leyland prisons.
Officers from Leyland Police and security staff from HMP Garth and HMP Wymott, on Ulnes Walton Lane, carried out an operation together to disrupt drug supplies into the prisons.
A total of 52 vehicles going into the two sites were stopped in total during the operation, which ran on Thursday between 11.30am and 3pm.
They were targeting visitors who could be bringing drugs in.
Eight officer were involved using Automatic Number Plate Recognition (ANPR) technology to track vehicle movements.
A number of vehicles were reported to defects but no drugs were found.
Chief Insp Richard Robertshaw said the operation was a success and further similar operations would be carried out in the future to crack down on the known problem.
He said: “This operation sends out a message that supplying drugs to prisons will not be tolerated.
“It was a successful operation and we will be running further operations of this nature in the near future.”
A Prison Service spokesperson said: “We take the illicit use of drugs in prisons and the problems they cause incredibly seriously.
“We are working hard to keep contraband out of prison, using a range of security measures to reduce drug supply, including working closely with police forces and carrying out random mandatory drug tests.”
HMP Garth is a category B training prison which has room for 847 inmates. It accepts prisoners who are serving sentences of four years or more and can accommodate up to 100 people who are serving life sentences.
HMP Wymott is a male category C trainer prison which has facilities for vulnerable prisoners and sex offenders and can accommodate over 1000 people.