Mr. Chair, I am going to let my colleague, Ms. Wherrett, answer that question, but first, I would like to give you a bit of background.
Today, people coming to a Canadian airport to get on an American flight first go to the airline ticket counter and provide their travel documents. The documents are
“swiped”—I don't have a better term for that.
The biographical data are captured by the airline, transferred to American customs and blended with the prior information on the travellers.
Second, travellers go to a screening point to get through security. Third, they go to an American officer. This decision is not taken lightly. People go through a number of steps before they get to an American officer.
I will let my colleague tell you about the ability to withdraw