I guess the case of Al Capone comes to mind here...
The rather corrupt and infiltrated legal and law enforcement authorities of the day could no collect enough evidence to make a case to present to a court...
Al Capone covered his tracks well and I guess was an expert at making key documents disappear from the most protected and access controlled vaults across old Chicago town...
However Elliot Ness and his Untouchables eventually managed to collar Al Capone on income tax evasion...
Al Capone went to prison and prison is prison regardless of what charge gets you there...
