SHEBOYGAN, WI (WHBL) - A Sheboygan man will be spending 4 years behind bars on drug charges. 31 year old Johan Keizer was sentenced recently in Sheboygan County Court to 4 years in prison to be follwed by 4 years on extended supervision. Keizer had sold heroin to undercover officers on several occasions in July of last year. He was arrested during one of the drug buys and swallowed the packet of heroin he had intended to deliver. Officers later executed a search warrant at Keizer's Lincoln Avenue apartment where they confiscated nearly $400 in cash and found evidence of heroin.