Detective Sgt. Kyle Schwarzmann said the investigation, dubbed "Extra Sugar" by police, was sparked by an "anonymous tip" about Melissa Redmond, 29, of Mine Hill, who worked the 9 p.m. to 5 a.m. shift at the Dunkin' Donuts on Route 46, The Daily Record, Parsippany, N.J., reported Tuesday.
Schwarzmann said he conducted surveillance on several occasions and saw Redmond follow customers to their cars and spend 10 to 15 minutes inside the vehicles.
"Sometimes I 'd even see money changing hands," Schwarzmann said.
He said Redmond was arrested after she listed her services and prices for an undercover officer and accompanied him to the back of the building in his car.
Redmond was charged with prostitution and released after processing, police said.