Members of NSW Police are set to be grilled by the state's law enforcement watchdog over the strip-searching of a 16-year-old girl at Splendour in the Grass.

The Law Enforcement Conduct Commission (LECC) has confirmed it will investigate the 2018 incident at the music festival near Byron Bay, on the NSW North Coast, and scrutinise the practice of strip-searching more generally during a three-day public hearing next month.

A police sniffer dog checks revellers at this year's Splendour in the Grass festival. Credit:Paul Harris

A NSW Police spokesperson said he was unaware at this stage whether or not Police Commissioner Mick Fuller would be giving evidence before the inquiry.

Police can only carry out field strip-searches if the urgency and seriousness of the situation requires it and, in the case of minors, if a parent or guardian is present, unless an immediate search is necessary to protect the person or prevent the destruction of evidence. Children under 10 cannot be strip-searched.