The Green Party has drafted a bill that would require casinos to pay back proceeds received through criminal activity.
The Bill will amend the Criminal Proceeds of Crime (Recovery) Amendment Act to impose a special obligation on casinos to return profits derived from significant criminal activity, and which they should have detected.
Green Party gambling spokeswoman Denise Roche said problem gamblers were targeted under the existing law but the casino would not suffer.
"When problem gamblers are convicted of stealing from their employers, or laundering drug money through the casino, everyone suffers except the casino, who pockets the profits."
"The addict is jailed, and loses their job, their family and friends. Their employer can be ruined. But the casino is better off as a result of the crime. That's not fair," said Ms Roche.