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Was this the person's first DWI arrest?
OK. It is a misdemeanor. As far as avoiding an arrest, that is really a two part answer.
First, warrants are nationwide, so if this person enters the US, customs will see that there is an active warrant and take the person into custody. However, most states will not extradite for a misdemeanor, so the person would be taken into custody, but most likely released a few days later when Arizone refuses to extradite.