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NEW YORK (CNNMoney) — The NBA imposes millions of dollars worth of fines on players each season. But it’s not clear where exactly that money goes.

Other pro-sports leagues — the NFL, MLB and NHL — are very up front about how they donate player fines.

NBA players have paid more than $1.6 million in fines about half-way into the 2016-2017 season. That’s based on data from Spotrac, which monitors athlete contracts and financials.

According to the league’s collective bargaining agreement, the money goes to charities chosen by the NBA and the National Basketball Players Association.

The NBPA’s half of the money goes to its foundation. However, it’s unclear where the NBA’s half goes. The league declined to disclose the names of any of the charities that get fine money.

Other sports leagues state clearly where their money goes.

In the NFL, fines are donated to the NFL Player Care Foundation and the Players Assistance Trust.

The foundation provides retired players with financial assistance, while the trust helps former players financially with things like medical expenses and completing their undergraduate degrees.

Since 2009, about $4 million a year from on-field fines has gone to help former players, according to the NFL.

In MLB, the money from fines goes to MLB Charities — a non-profit that supports groups like the Boys & Girls Clubs of America, the National Recreation and Park Association, the National Urban League and the Jackie Robinson Foundation. Some of that money also goes to the Baseball Assistance Fund, which helps former players in financial need.

All fines in the NHL are donated to the league’s Players’ Emergency Assistance Fund, which helps former players financially.

In addition to fines that players incur during a game, the NBA also fines players for other infractions, according to the CBA.

They’re fined $2,500 the first time they skip practice during a season. Failing to make a promotional appearance is a $20,000 fine. So is missing a mandatory educational program like anti-gambling or media training. Skipping the NBA’s “business of basketball” program means a $5,000 fine.

While the CBA only applies to players, the league also collects fines from coaches, owners and officials.

Dallas Mavericks owner Mark Cuban, who has been fined thousands in the past, told CNNMoney that he has no idea where the money ends up.