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The investigations involved police officers posing as girls aged between 13 and 16 accessing the internet in order to uncover adults who were seeking to procure children online for sexual activity.
The results of this study show the aggressive and rapid way that children are targeted by adults for sexual purposes.
In sentencing, Judge Deborah Richards told the court one incident involved threatening a young child with harm.
Brooker, who was between 38 and 47 years of age at the time of offending, contacted young girls via social media sites Kik, Tagged and Facebook using the name 'Jaz', 'David Bourne' or 'David Brook'.
In the District Court in Toowoomba on Tuesday, Brooker pleaded guilty to 57 charges, including maintaining a relationship with a child under 16, carnal knowledge, indecent treatment and making and possessing child exploitation material.
Brooker left the QAS during the 10 years of offending and began to work for a private firm as a paramedic.
Brooker's defence lawyer David Jones told the court his client had not shared any of the child exploitation material he created.