MERRICK - The man at the center of a Nassau County Police Department scandal involving three former top officials was sentenced today to prison on unrelated charges.Zachary Parker was sentenced today to two-and-a-half years in prison for possession of a controlled substance and driving while ability impaired by drugs. Parker made headlines earlier this year after three top Nassau police officers were accused of trying to cover up a burglary investigation into Parker because his father is a police benefactor. The 21-year-old was sentenced last week to one to three years behind bars for driving with a revoked license while already on probation for stealing computers from his high school, the original burglary charge.Man involved in PD scandal to serve time for violating probationProsecutors: 20-year-old in PD scandal violated probationSuspect at center of Nassau PD scandal sentenced to probation