the pressure the US DOJ attorneys put upon him became unbearable. their high pressure tactics which involve piling on charges and threatening the target with so many years in prison as to be lifetime for some can had adverse affects on people. Sadly this is par for the course as the prosecuting attorney and their office do not get called to account for their methods or out comes.
this is very difficult to correct as many times the target is politically acceptable to many and therefor they just give the DOJ free reign to apply it to anyone they choose.