A senior NSW Police constable has received a grilling after telling a law enforcement inquiry he could not remember whether he had stripsearched a child at a music festival in Sydney's west.

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Key points: The Commissioner grilled the officer who claimed he could not remember stripsearching the boy

The Commissioner grilled the officer who claimed he could not remember stripsearching the boy The inquiry has heard only six of the 31 children stripsearched by police at the Lost City Music Festival had a parent or guardian present

The inquiry has heard only six of the 31 children stripsearched by police at the Lost City Music Festival had a parent or guardian present The festival is only for children aged between 13 and 17

A hearing by NSW's Law Enforcement Conduct Commission (LECC) is looking into several illegal strip searches undertaken by police at the Lost City Music Festival held at Sydney Olympic Park in February.

The senior constable was probed this morning over allegations he stripsearched a 15-year-old boy without a parent or guardian present, despite legislation requiring it.

During questioning, the constable repeatedly claimed he couldn't remember conducting any strip searches at the event.

Commissioner, the Honourable Michael Adams QC, wouldn't accept a lapse in memory.

"Are you saying you could have forgotten?" the Commissioner asked the officer.

"I may have," he replied.

"Are you saying you might have forgotten at this festival stripsearching a young person in the presence of a parent?"

"I wouldn't believe so," the officer said.

"Does it follow then, that you didn't stripsearch anyone at this music festival?" the Commissioner asked.

"Yes," the officer replied.

When presented with evidence of a field processing form written in his handwriting the officer claimed he had no memory of the event but must have watched as his colleague conducted a general search on the boy rather than a strip search.

The boy alleges he was searched by two police officers after a drug dog lingered near him and his brother at the festival, which is for children aged between 13 and 17.

In an interview with the LECC, the boy said an officer asked him to pull down his pants then directed him to: "Hold your dick and lift your balls up and show me your gooch."

Counsel Assisting Dr Peggy Dwyer told the hearing the 15-year-old said he "froze" during the procedure and was now fearful of being close to police.

One of the two officers is also accused of searching both the boy's wallet and phone, including his messages, without permission.

The other officer alleged to have been involved in the search is expected to give evidence to the Commission later this week.

The hearing has heard only six of 31 teenagers stripsearched by police during the event had a parent or guardian present.