G4S shares fall amid revelations of financial scandal (VIDEO)

The troubles just keep mounting for under-fire security firm G4S. They are facing 'a forensic audit' after inconsistencies were discovered between the work the firm charged for and what it actually did.

G4S is privately contracted to provide a host of justice-related work including transporting prisoners and monitoring their electronic tags. G4S are said to have billed the government for monitoring prisoners who had left the country, been returned to prison or had even died.