U.S. consular officials at the Vancouver U.S. consulate were asked if third country nationals could apply for a visa at their office. Here's their response.
"[Third country nationals should not consider applying for a visa in Canada] when they are visa or forum shopping. We will take the cases of people who are resident and present in Canada, including TCN’s coming from the US. It’s usually quite evident if something weird is going on, and those sorts of cases are problematic, and prone to more scrutiny and possible refusal. Applicants coming from other countries should be aware of language issues and sufficient proof of ties to residence abroad.
Also, applicants who have faced – or might face -- “administrative processing” should think long and hard about where and when to apply. There are many news items on applicants stuck in Mexico or
Canada while they await resolution of their visa application."
