Police said when the clerk opened the cash register to make the sale, the suspect said "Hand me the twenties." When the clerk asked him if he was sure, the robber said "Give me your twenties now" and put his hand in his right jacket pocket, indicating he had a weapon.
Police said after the clerk turned over the money, the robber fled the store and got into a black Mazda Protege parked outside. They said the clerk followed the robber outside and shattered his windshield and passenger door window with a club.
The robber fled west on Maple Avenue, police said.
At about 11:15 p.m., Office Wayne Hose found a Mazda fitting the description of the robber's car parked in the 400 block of North Potomac Street and had it towed to police headquarters, officers said.
The car was registered to Baer, they said.
Police said at 1:18 p.m. on Friday, Officers Shawn Schultz and Todd Webster stopped Baer, who fit the description of the robber, in the North Jonathan Street area. After being interviewed by Detective George Knight at police headquarters, he was charged with the robbery.
Police said they recovered $750 of the $1,250 taken in the robbery. They said Baer told officers he went to North Jonathan Street to buy crack cocaine.
Police said the "weapon" used in the armed robbery was the robber's finger. He had no gun, they said.