Originally Posted by
UshuaiaHammerfest
The arrest is already on the record, and I have yet to hear a LEO ask "Have you ever been convicted of a crime?" -- especially an immigration officer in any country (not just US). Whenever I've been asked about criminal history by a LEO, whether police or immigration (entering Canada as a US citizen, for example), it has always been phrased "Have you ever been arrested?"
If you answer yes, then my guess is the next question will be "what happened next?" and you can specify if you were convicted or not.