Flying from Washington state to Canada

wrote in message . ..
Here is the checklist that I have used to fly to and fro Canada. Best viewed
with a fixed width font.
....
DO NOT CROSS THE BORDER WITHOUT
SQUAWKING THIS CODE.
...
* The FSS operator will give you a border-crossing squawk-code.
If they do not - ASK!

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From Canada into U.S.
...
DO NOT
CROSS THE BORDER WITHOUT SQUAWKING THIS CODE.
...
3. Set your border-crossing squawk-code.

* If you haven't gotten your border-crossing squawk-code call
Canadian ATC IFR Flight Planning at 1-888-987-2633 and request
one. Even if you are flying VFR.

I flew to Canada a few years ago, and didn't need a squawk code either direction. Is this something new since 9/11?