According to a player who spoke on the condition of anonymity, Lot O Games was allegedly allowing people to play 8-liner machines with fake money, then letting them trade that in for cash -- but only on Sundays.
The woman, who has played at Lot O Games often in the past two months, was inside when agents with Homeland Security Investigations raided the building around 3 p.m. Sunday.
"They busted in, there was about five of them and more outside," she said.
The woman said the agents asked for identification from the 30-plus people playing at machines inside -- then let them all go free.
The video of the raid she captured on her cell phone shows 8 Liner machines lining the walls in the smoke-filled room and dozens of people at play.
She said the machines took cash or the paper money given to patrons.
"The least was $10, but I saw people sticking hundred dollar bills in there," she said.
On Sundays, the fake money was traded in for cold, hard cash, she said.
The woman, who walked away herself with several hundred dollars in winnings, said she saw stacks of cash sitting on the counter on Sundays as the owner paid people out.
At the time, she said she did not realize anything was illegal about the entire operation.
"We heard about it through word-of-mouth," she explained. "I thought it was a fun place to go."
Agents with Homeland Security Investigations said Monday they are still investigating and are not releasing any information about the raid at this time.