What Changed for US Sports Betting After the 2018 Court Ruling
A plain overview of how the 2018 Supreme Court decision let states regulate sports betting, and what that means for age limits, licensing and oversight.
Few legal decisions have reshaped American sports culture as quickly as the Supreme Court's 2018 ruling on sports betting. Before it, wagering on games was largely confined to one state. Afterward, the question moved to statehouses across the country. This overview explains what changed and what remained the same. It is general information, not legal advice, and laws are updated often, so consult your state regulator for current rules. Content is for readers 21 and over, or the legal age where you live.
The law before 2018
In 1992, Congress passed the Professional and Amateur Sports Protection Act, known as PASPA. It barred most states from authorizing sports betting, with exceptions for states that already had some form of it, notably Nevada. For more than twenty-five years, legal single-game sports wagering was effectively limited to Nevada, while illegal markets operated elsewhere.
The 2018 decision
In May 2018, the Supreme Court decided Murphy v. National Collegiate Athletic Association. The justices held that PASPA violated the Constitution because it told state legislatures what laws they could or could not pass. The decision did not legalize sports betting nationwide. Instead, it returned the question to each state, which could decide whether to permit it and under what rules.
A patchwork of state rules
Since then, many states have created their own frameworks, and others have kept it prohibited. Rules differ on several points:
- Who can offer it: retail sportsbooks at casinos or tracks, mobile apps, tribal operations, or a state-run model.
- Minimum age: most states set it at 21, though a few use 18.
- Taxes and fees: states set their own rates on operator revenue, which affects funding for programs.
- Allowed markets: some states restrict bets on in-state college teams or certain player props.
Because rules vary and change, the safest way to know what applies to you is to check the official website of your state gaming regulator.
Integrity and oversight
Legal markets brought new attention to sports integrity. Leagues and regulators now share data and monitoring tools to flag suspicious betting patterns, and licensed operators must follow anti-money-laundering and age-verification rules. Mobile wagering typically requires location checks so that bets can only be placed within permitted states.
Consumer protections
Regulated markets usually require operators to provide responsible gambling tools. Common examples are deposit limits, time-outs, and self-exclusion lists. Advertising has also drawn scrutiny, with lawmakers and regulators examining how promotions are presented and who sees them. The existence of regulation helps with transparency, but it does not alter the odds: every wager still carries a margin, as shown in our guide to reading American odds.
What the decision did not do
The ruling did not remove federal laws that deal with other issues, such as the Wire Act or rules about payment processing. It also did not change the fact that gambling can cause harm. For warning signs and support, see our article on problem gambling warning signs.
Frequently asked questions
Is sports betting legal in every state now? No. Availability depends on state law, and some states still prohibit it.
Can I bet from a state where it is illegal using an app? Licensed apps must restrict betting to permitted locations. Using unlicensed offshore sites carries risks, including no consumer protection.
How can I check whether an operator is licensed? Your state gaming regulator publishes lists of licensed operators on its official website.