A Bay Shore doctor was arrested yesterday and charged with illegally selling prescriptions following an undercover law enforcement investigation that began in January, police said.

Oncologist Binod Singh, 40, of 33 Oakwood Blvd., was arrested at about 12:45 p.m. after he was stopped in Bay Shore for driving erratically, Suffolk police said. Singh was also charged with second-degree criminal sale of a controlled substance, and two counts of criminal diversion of prescription medications and prescriptions, and with driving while intoxicated.

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Multiple federal state and local drug law enforcement officers were involved in the investigation of Singh, Suffolk police said. Singh was, engaged in an ongoing course of prescription fraud, police said. Authorities said Singh used a network of individuals who would fill prescriptions that were written without medical necessity. State records indicated than Singh has issued several hundred prescriptions over the past year according to police. Police said Singh admitted to investigators that he has not treated a patient since last April.

Singh sold some 350 Oxycodone pills and two blank prescription forms during an undercover operation, police said.