GARDA searches are continuing at the three-acre site in Chapelizod for missing man Trevor Deely.
A Garda team has been carrying out an intensive search of the council-owned site following a tip-off claiming that the body of the 22-year-old bank worker from Naas, Co Kildare, was dumped there after he was murdered by a criminal following an office Christmas party in Dublin in 2000.
Last week, gardaà were examining a gun found at the search site to establish if it is connected to his disappearance.
Gardaà have divided the search area into four zones and say the search of the derelict land may take several weeks.
Last week, the Irish Aviation Authority banned drones from flying over the site.
The Department of Justice made a request to the Minister for Transport asking him to impose flight restrictions for security reasons.
The request was acceded to and the ban will remain in place until the end of the month.
The flight restriction notice issued by the IAA applies to all unofficial aircraft, including model planes and drones.Â
There are exceptions for emergency air ambulances and search and rescue aircraft.
Mr Deely, a Bank of Ireland worker, was last seen in the early hours of December 8, 2000, in the Haddington Road area of the city centre.
The last known images of him were captured by a CCTV camera at the junction of Haddington Road and Baggot Street at 4.14am.
A man dressed in black, who gardaà believe also spoke to Mr Deely outside his place of work minutes previously, can be seen following him in the direction of Haddington Road.
This footage was only made public earlier this year after a specialist unit, set up in Pearse Street Garda station to review the case, secured improved CCTV images.
