Set in Seattle, Washington, the series follows the police investigation, the grieving family and the suspects, after the homicide of a young girl, Rosie Larsen (Katie Findlay). Each of the 13 episodes chronicles one day of the investigation.
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This portrayal sounds like a mild version of past portrayals of savage and uncivilized Indians. It sounds like it has racist undertones. The suddenness of the casino's appearance suggests that someone has an axe to grind.
Yes, most Indian casinos are on sovereign land where tribal law applies. That includes the ATMs outside the casinos. Because of overlapping jurisdictions, it's possible that nontribal police could get a warrant for a tribal ATM. But I don't think it's very likely.
For more on the subject, see TV Shows Featuring Indians.