A Dutch police source said: "The tests are being used but we are certain that this man is indeed O'Rourke.
"We are interviewing him in relation to the discovery of cannabis. Police in Merseyside have been informed." Once the test results are returned from the laboratory Merseyside police will then start to look at what to do next.
They could only extradite O'Rourke if they were able to charge him as soon as he set foot on British soil.
That is not possible as police have yet to question him so officers from Merseyside are likely to fly to Amsterdam to quiz him.
But the sticking point will be the Dutch police investigation into O ' Rourke ' s alleged drug links.
They will want to put him through their own legal system - which could mean long delays in the Ungi murder inquiry.
A Merseyside police spokeswoman said: "We cannot comment on this matter at this stage."
The killing of father-of-three Mr Ungi, 35, sparked a violent gang war in the south of the city.
In the 18-month period after his death there were 50 shootings in the area with several innocent bystanders getting caught in the crossfire.
As well as Toxteth-born O'Rourke, 34, another man, 26-year-old Darren Jackson, is also wanted in connection with the murder of Mr Ungi.
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