She said the latest statistics from the Fair Work Ombudsman constituted the initial reports that were referred to the Immigration Department for action, and did not represent a "finding of fact" on employer wrongdoing.

The government takes visa violations extremely seriously, she said, but employers and labour hire companies flouting the law were a small minority.

"Reports of significant rorting of the 457 visa program are completely unfounded and based on a misrepresentation of the data provided by the Fair Work Ombudsman," Senator Cash said.

20% of 560 workers is significant and thats just the cases investigated. There is not enough staff to investigate every worker same as there is not enough staff to investigate every tax statement thats dodgy. Is Senator Cash the same person who had the suss Cadbury lobbyist as an advisor ? The govt wants to relax the conditions for visa entries even further than the soft conditions already in place.

If they wanted to tighten the rules they would be shouting rorts from the rooftops.

http://www.theage.com.au/national/one-in-five-migrant-workers-on-457-visas-could-be-underpaid-or-incorrectly-employed-20150529-ghcmxr.html