As to the question of whether states can make laws governing Indian tribes, concerning gambling on Indian reservations in the state of Texas, that is a very contentious issue, and one which the state of Texas has won, so far, against the Tigua Pueblo Indians, here in the very a-hole of Texas.
According to PBS NOW,
"In 1992, with Indian gaming laws in place, the Tigua tribe of El Paso, Texas petitioned then-Governor Ann Richards to allow casino gambling under a tribal-state compact. Richards rejected the tribe's request. In 1993, despite their failure to get government approval, the Tiguas opened Speaking Rock Casino. Over the following decade, the Tiguas and the Texas state government battled over the legality of the casino. While Governor George W. Bush, governor of Texas at the time, contended that Speaking Rock violated the state's anti-gambling laws, the Tiguas argued that their slot machines were similar to the state-run lottery games, which used computers to randomly generate numbers for players.
"While the casino business continued on Tigua land, the Texas state attorney general sued the tribe to shut down Speaking Rock. In January 2002, the Tiguas argued their case before the U.S. 5th Circuit Court of Appeals to no avail. When the casino closed in February of that year, close to 800 employees were left without jobs."
"It was at this time that Jack Abramoff approached the Tigua tribe offering his lobbying expertise and Washington insider status to get the casino reopened." What he didn't tell them was that he had worked for the anti-gambling lobby that had had closed their casino in the first place. He and Michael Scanlon bilked the tribe and five others that they had hustled out of about six million dollars in fees.
http://www.pbs.org/now/politics/indiangaming.htm
