A LOVE letter from one prisoner to another forced an evacuation at the Port Lincoln jail today.
A staff member at the prison opened a letter containing a suspicious white powder and raised the alarm about 10.45am.
Staff were evacuated from the administration building as MFS and police investigated the substance.
However, it is believed the substance was scented talcum powder on a love letter sent from a female prisoner to a male inmate.
No one was injured in the incident.