CONCORD, N.H. — New Hampshire now has greater oversight of charity gambling events, which account for millions of dollars raised each year.

Gov. Maggie Hassan signed a bill into law Monday that gives the attorney general’s office and the Racing and Charitable Gaming Commission more power to audit and investigate the games.

The idea of greater oversight for such events as Monte Carlo nights evolved last fall while the state was considering whether to allow full-blown casinos in the state. A consultant hired by the state noted the state has a high concentration of table games such as roulette and blackjack where as much as $75 million is bet annually in the name of 389 charities.

“This bipartisan legislation implements important charitable gaming reforms that will strengthen our ability to effectively regulate the millions of dollars in gambling already taking place in New Hampshire,” Hassan said in a statement.

New Hampshire has allowed the mini-casino operations since 1977 with few limits other than on the size of the bet and the maximum days a charity can sponsor an event. A law change in 2006 allowed private operators to run the games and turned the traditional Monte Carlo nights into seven-day-a-week, full-scale operations that rake in millions of dollars annually.