It was a midday marijuana deal near Whetstone Elementary School in Montgomery Village.
The buyer, 22-year-old Eric Allie Jr. allegedly pulled out a gun, demanding cash and pot.
The seller turned victim suggested they drive to his parents' Germantown home to get an ATM card.
Allie casually waited in the driveway, while the seller went inside, secretly telling his father, an off-duty police officer what was happening.
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