"We want to be able to find a way of removing the departure cards (but) we have to have the integrity of statistics ."
She said work with Aviation Security on co-ordinating checks was in an early phase.
Staff had been to the United States and Canada looking at systems being used in those countries.
"The issue there is making sure we have an effective process to make sure Customs can maintain the integrity of its processes."
Customs numbers had been boosted by six staff around the country following new rules cutting the number of duty free cigarettes from the start of this month.
In the first three days of the new law coming into effect around 80kg of tobacco was put in amnesty bins and Customs had collected $7500 in extra revenue.
"A number of people had elected to pay the duty and keep the cigarettes."
Previously 200 cigarettes were permitted duty free but this had been cut to 50.