Riddle interviewed Lomax after the case was turned over to Gwinnett County police. The ex-deputy reportedly admitted to picking the boy up but said they only "cuddled and sucked on each other's necks."
"He said he did not know he was 13 years old," Riddle testified.
At the end of Thursday's hearing, defense attorney Teri Thompson asked for the charges against Lomax to be dropped. She argued that the alleged victim was the only witness to the incident and that there was "no physical evidence to sustain the charge."
Magistrate Judge Bob Mitchum didn't buy it and bound over the charges against Lomax, meaning his case will now move on to Superior Court. Bond was not considered.
Lomax, a Lithonia resident, has remained in the Gwinnett County jail since his arrest.
His arrest marked the sixth of Gwinnett deputy since 2012, and Thursday morning's hearing came a day after another now-former member of local law enforcement, ex-Lilburn Police Department Officer Gary Livingston, was indicted on charges related to an on-duty "inappropriate touching" incident.