Incorrect and absolutely false information that you are spreading.   The statute of limitations CANNOT BE WAIVED!   However, the statute of limitations STARTS when the fraud is or SHOULD HAVE BEEN discovered.   

So if the statute of limitations is 10 years to make it easy:   Fraud that happens in 1980 or 2016 but was discovered in 2017 would have to be charged by 2027.   If fraud happened in 2001 and was discovered in 2004 then charges could no longer be filed because the timer ran out in 2014.  If fraud happened in 2001 and an audit was done of those years in 2002 and fraud was discovered in 2017 the statute of limitions would have run out in 2012 as the audit should have detected the fraud.   So the government could be up against one or another statute of limitations timeframe or another already if it is looking back at something it first started investigating in 2014.