Some people say CAN + only for Indian citizens but I don't think that's true.
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It was a pilot project started in july 2014 for Indians and was 95% successful. So they continued the program. You can search for CAN+ in CIC website and see the questions they replied on FAQ. Also i read somewhere that it was started for MEXICAN nationals at the same time as pilot project. So far it states it is for INDIAN Nationals but not sure. I will let you know if i find any more info on this.
I just received BVL for my parents visitor visa i applied on IRCC Portal April 13,2022.