It was just after midnight on a Friday morning in October when Jordan Kerr decided he no longer wanted to play blackjack at the Horseshoe Casino in Baltimore.

A supervisor approached, told him to step away from the table and asked to see his driver’s license, Kerr said, which he declined to do. Nothing new for a seasoned card counter.

But Kerr said that when he stood up and walked toward the exit, he was swarmed by security officers, leading to a tense standoff before he was taken to a back room.

Last month, Kerr filed a lawsuit over the incident, claiming security officers illegally detained him while they waited for police to arrive. But police never came, Kerr said, because he hadn’t committed a crime.

Horseshoe Casino, which is owned by Nevada-based Caesars Entertainment Inc., did not respond to a request for comment.

Normally, card counters like Kerr don’t like when their name is publicized. But Kerr — who prefers the term “advantage player” — has been doing this for more than a decade, he said, and most casinos already know his identity.

This lawsuit is about accountability, Kerr said.

“I just want to make sure they don’t treat other people like that,” he said.

In 2018, he filed a similar lawsuit against a casino in New Orleans. It settled out of court.

Horseshoe Casino opened in Baltimore in 2014 to fanfare from city leaders, who believed it would catalyze development in the surrounding area. But in recent years, gambling revenues have steadily declined, public records show, and the size of its staff has dwindled to one-third of its original employee count.

Kerr said he’s played blackjack at Horseshoe Casino numerous times during his career, occasionally staying at the “little dumpy hotel” next door.

“It definitely seems like it’s on the decline,” Kerr said of the casino.

Kerr said he gambled for a few hours on the night of the incident. He said he was winning at first, but then his luck turned.

By the time security staff approached, Kerr said, he was losing money.