I-94 and driving to Canada

[w8nc]

On my last trip to Canada I drove my car across the border. At Canadian customs and immigration I first handed the officer my I-94 and then my passport. After a few questions he handed my passport back to me.
On the return part of my trip at US customs and immigration I handed the officer my passport and AP. He asked a few questions and handed the documents back to me and said I could proceed. I then asked "don't I need an I-94". To my surprise, he said "you already have one". Apparently the Canadian officer did not keep the I-94.
I was a little concerned about this and checked with my lawyer. I was told that when driving into Canada, they will enter your I-94 into a computer and then return it to you.
Is anyone else familiar with this procedure?

 

[Exile_2001]

The same thing happened when I went to Mexico from California about 3 months ago. Walking over the border to Tijuana there are no US immigration staff to give the I-94 to. On the way back I was told I did not need another one as I already had one.

Basically I left the US and came back and nobody even logged it into the computer.

I could also mention that the check of my passport consisted of an immigration guy seeing I was holding up a passport with my visa page open 3 feet away from him and waving me thru disinterestedly.

Not quite LAX.

 

[clearsky]

Usually immigration will allow you to keep your current I-94 if you go to Canada or Mexico or few other neighboring countries.