A Ridge couple was arrested Thursday evening after police witnessed what they believed was a drug transaction and said they found the pair in a car in possession of drugs -- their 7-month-old daughter in tow.

Suffolk County police said the incident took place on Church Lane in Middle Island about 6:15 p.m. after officers assigned to the Burglary Larceny Task Force saw the couple in their car -- and believed they were witnessing a drug transaction.

Police then stopped the car, a 2008 Volkswagen Jetta, finding drugs and drug paraphernalia.

Arrested were William Grover Campanaro, 28, and Koralynn M. Ingraham, 23, both of Farmhouse Road. Each was charged with first-degree loitering and endangering the welfare of a child, police said.

Campanaro was found to be in possession of heroin, police said, and also was charged with seventh-degree criminal possession of a controlled substance.

Police said Ingraham also was charged with criminal possession of a hypodermic needle and seventh-degree criminal possession of a controlled substance. She later also was charged with criminal impersonation after she identified herself as her younger sister -- to avoid being arrested for an outstanding warrant.

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The child, who was not hurt, was released to a family member, police said. Police said they notified Child Protective Services.

Campanaro and Ingraham are scheduled for arraignment Friday in First District Court in Central Islip.