A prisoner at HMP Lancaster Farms was placed in segregation as punishment after parcels were thrown over the prison wall containing banned items including mobile phones, cannabis, and a tooth whitening kit.
Police were called to the prison at 4.05pm on July 16 by prison staff who discovered the parcels containing the prohibited items .
The parcels contained cannabis, the now illegal high Spice, steroids, mobile phones and a tooth whitening kit.
The items were taken by police and will be destroyed.
Police are asking dog owners and walkers who exercise their animals around that area to be vigilant of any suspicious behaviour or activity.
A Prison Service spokesman said: “Staff at HMP Lancaster Farms recovered a package on Saturday July 16. The incident is being investigated by the police and one prisoner has been placed in segregation.
“We have introduced new laws that mean those caught trying to throw packages over prison walls can now face up to two years in jail.
“We take a zero tolerance approach to contraband in our prisons and work closely with the police and Crown Prosecution Service to prosecute those involved.”