Four people were arrested within the first 24 hours of Encore Boston Harbor's opening.
Two men were charged with cheating at a roulette table, one person was arrested for disorderly conduct while another arrested for trespassing.
In addition, one person was issued a summons for possession of heroin.
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Despite the arrests, state police said that there have been no major incidents and that things have been running smoothly at the Everett casino.