Hi I hope to help you with your question today. Generally a criminal conviction in Canada can cause a person to be prohibited from entering the United States. It is more likely that a check will be done at the border when driving than when flying, especially if you are able to take a direct flight to Hawaii. However, it sounds as if you are unsure if he actually has a criminal conviction. Check with the officials in your jurisdiction or where the incident happened. They should be able to clear that up for you. Additionally, if he does actually have a conviction, he can apply for a US Entry Waiver.
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