I used to live in Windsor and I've flag polled before (back in 2010). But, not for completing my landing as a permanent resident. I flag polled for my co-op work permit. I took the Windsor tunnel bus and they dropped me at border. I told the officer I'm not intending to enter US and all I'm here is for flag polling and getting my work permit. Two officers escorted me to the bus and on the way I got dropped at the Canadian border and then there was an officer waiting outside I gave him the sheet where it said I got refused to enter USA and I'm here for my work permit. The officer took me to an immigration officer . I produced all the docs and then got my work permit in 5 mins. I'm not sure whether this story was of much help . Bur I thought I should share this