The Customs Minister says using cash can help hide exploitation.
A Ministerial Advisory Group has released its second report - criticising our response to modern crime and money laundering.
It shows cash and assets seized by police total just 4.2 percent of the $1.6 billion criminals make each year.
Casey Costello says cash payments also aren't good for workers.
"In terms of protection of workers and assuring that deductions are being done properly and pay is being managed properly and that they are getting all their entitlements - the cash process makes it very difficult concerning those things."
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