The unruly tourists have generated headlines across the country.
Customs Minister Kris Faafoi says a member of the 'unruly tourist' family should never have been able to leave New Zealand - using someone else's passport - while facing criminal charges
Faafoi conceded today that it was a case of "human error which shouldn't have happened".
"While it isn't acceptable it is very rare," a spokeswoman for Faafoi said.
Customs officials are reviewing processes after a man wanted in relation to an Auckland roofing scam slipped through Customs using someone else's passport.
Late last week, police said their investigations into his whereabouts had led them to believe he had fled New Zealand.
It has since been revealed a mistake was made by a Customs staff member; which led to Nolan slipping through at the Auckland International Airport.
In a statement released last night, Customs said they had robust procedures and systems in place to protect our borders, but acknowledged that Nolan had managed to get through on false pretences.
"James Nolan deliberately circumvented border controls by using a valid passport that was not his own.
"He used an eGate, which uses biometric data to match and confirm the identity of a passenger. The eGate identified further checks were needed on the passport.