The arrest, all caught on video, shows the councilman asleep with a crack pipe before officers wake him.
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A concerned passerby had seen Matthew Reilly and called police.
Police also found a bag of cocaine at the scene.
Even officers seemed to be shocked by what they found.
"You're a councilman in Cranston, smoking crack, with crack on you. What do you think the constituents would say?" An officer asked Reilly, bodycam footage shows.
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Reilly told them he had smoked crack earlier at his home after being clean for 13 years.
He says he relapsed due to a bad divorce.
Reilly, who is an attorney, also resigned as chairman of the Cranston Republican Party.