PCSO Jodie Dunsmore, who has since become a full-time police officer, says "mother's intuition" prompted her to raise the alarm over Amanda Hutton and her home.
The investigations of PC Dunsmore, who says "she knew something wasn't right," led to the discovery of the four-year-old's mummified body.
Following the conviction of Amanda Hutton, questions are raised over two little boys killed by those who were supposed to care for them.
A mother who starved her son to death threatened to kill her other children, a judge who sentenced her to 15 years in prison heard.
For two years the mummified body of four-year-old Hamzah Khan lay hidden in his mother's squalid house.