The difficulty is does this 8% reflected those cases the police determine as unfit or does it include those tested in court and found to be false. As it does seem based on police investigation which would be separate from court proceedings it is to be suspected 8% is not an accurate reflection of false allegation.

The F.B.I. also state in the URL you provided, that university reporting is also included. There is a great deal of reporting on the net where political correctness has robbed the accused of knowing the accuser, the nature of the offense and denied the benefit of counsel. One need only look at Mattress Girl whose false allegation sees Columbia University and Rolling Stone on the end of lawsuits as they acted solely on her word without investigation. Makes you wonder how many untested cases make the F.B.I. list as credible.