(CNN) — A California man who lost $500,000 at blackjack and pai gow is suing a new Las Vegas casino, alleging he was too drunk to be allowed to gamble over a 17-hour period just before Super Bowl weekend.
Mark A. Johnston of Ventura, California, is claiming he shouldn’t have to pay the Downtown Grand Las Vegas Hotel & Casino the $500,000 debt because employees served him so much alcohol that he suffered a blackout and was unable to remember the losses or even his gambling, the lawsuit alleges.
The Nevada Gaming Control Board is now investigating the Downtown Grand, formerly the Lady Luck Casino, on whether it violated gaming regulations, said Karl Bennison, chief of the board’s enforcement division.
Those regulations prohibit casinos from “permitting persons who are visibly intoxicated to participate in gaming activity” and from providing “complimentary service of intoxicating beverages in the casino area to persons who are visibly intoxicated.”
“We are investigating this thoroughly,” Bennison said. “We are aware of this matter. We’ll see if there are regulation violations.”
The casino could face a license revocation or fines or both if the violations are substantiated, Bennison said.
The casino, which opened last November, declined to comment on the lawsuit or the state investigation, citing pending litigation, said spokeswoman Nicole Neal.
Johnston, 52, a frequent gambler in Las Vegas, had always been a cash player at casinos and was never issued a line of credit more than $25,000. Still, in the past 10 years, he had never drawn on any casino line of credit, the lawsuit said. He worked in real estate and car sales and was the owner of a Mercedes-Benz dealership in west Los Angeles.
During Super Bowl weekend, however, he and a female friend flew from the Burbank, California, airport to Las Vegas, and he had consumed several alcoholic drinks by the time the couple ate dinner at a restaurant run by the Downtown Grand Casino, according to a sequence of events described in the lawsuit.
At dinner, Johnston was visibly drunk, which was also observed by an old friend, a law professor at the University of Nevada at Las Vegas who joined the pair for dinner.
Johnston was so inebriated that he had no recollection of leaving the restaurant on January 30 or the subsequent 44 hours, when he gambled in the casino and took out markers totaling $500,000.
He lost all that money at the Chinese domino game pai gow and at a private blackjack table during 17 hours of uninterrupted gambling and drinking, until the late afternoon of the following day.
Johnston takes prescribed medication that increases the intoxicating effects of alcohol, and a casino host who invited Johnston to the Downtown Grand was aware of Johnston’s use of the medication, the suit alleged.
“Mr. Johnston, an experienced gambler, was dropping chips on the floor, confusing chip colors, and slurring his speech badly, and he was unable to read his cards or set his hands properly,” the lawsuit said.
“To her shock, after sleeping for seven to eight hours, (Johnston’s female friend) found Mr. Johnston still gambling at the blackjack table, and still heavily intoxicated, late in the afternoon of January 31, 2014,” the suit said.
The suit recounts how Johnston took out two lines of credit for $100,000 each in the span of 21 minutes after 2 a.m. on January 31.
By 10:52 a.m., Johnston had taken out a third marker, for $50,000. Almost two hours later, he signed another marker for $250,000, the suit said.
Johnston lost it all. Moreover, the casino allegedly reneged on providing Johnston with a 20% discount on repaying the $500,000, which would have reduced the debt to $400,000, the lawsuit claimed. The casino also allegedly demanded that Johnston repay the $500,000 debt 46 days early, before a March 31 deadline, said the lawsuit, which was filed in February.
In the days after losing the $500,000, Johnston went to the Hard Rock Hotel and Casino, one of his preferred Las Vegas gaming destinations, but a Downtown Grand representative called the Hard Rock and told them of Johnston’s debt, cautioning them about doing business with Johnston and “sullying Mr. Johnston’s good name in the process,” the lawsuit said.
The lawsuit seeks to nullify the gambling losses and seeks compensatory as well as punitive damages “in an amount sufficient to deter the Downtown Grand from similar conduct in the future,” the suit said.
By Michael Martinez and Kyung Lah
CNN’s Jack Hannah contributed to this report.