CENTRAL ISLIP - Bail was denied today for a Great Neck doctor accused of selling painkillers and prescription drugs to the Medford pharmacy killer. Dr. Eric Jacobsen, appearing before a judge in Central Islip, was denied bail after being labeled a danger to the community. Jacobsen admitted to writing prescriptions for David Laffer and his wife, Melinda Brady, before Laffer opened fire at Haven Drugs in June 2011. Prosecutors say Jacobsen ran a massive operation in which he illegally distributed OxyContin, and even left prescriptions under his doormat for patients in exchange for cash. They say he also hired a doctor and nurse practitioner after his license was revoked. Prosecutors: LI doctor slipped prescriptions to Laffer$1M seized from LI doctor accused of writing phony prescriptions