A disgraced Long Island ex-prosecutor is using his own experiences in the big house to peddle consultancy services to white-collar criminals headed to federal prison.

Christopher McPartland, once Suffolk County’s top corruption watchdog — ironically sentenced to five years in federal prison on corruption charges for covering up a police chief’s beating of a prison inmate — is now a high-priced consultant for mostly affluent convicts through his self-founded firm, McPartland Federal Prison Strategies, according to his LinkedIn and Newsday.

“I was a prosecutor in the Suffolk County District Attorney’s Office in New York for 26 years,” McPartland’s LinkedIn bio reads, boasting his accomplishments such as prosecuting organized crime cases.

“I was also convicted of Obstruction of Justice a

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