A quote from Dr. Chilton in a TattleCrime article includes a typo: "He man not even be human."
Alana comments that even without Hannibal's confession there was ample evidence to convict him of several murders. It has been stressed repeatedly through the series that Hannibal as "The Chesapeake Ripper" does not leave forensic evidence.
Alana is likely referring to the events of the season two finale, and any evidence discovered in Hannibal's home afterwards.
Alana is likely referring to the events of the season two finale, and any evidence discovered in Hannibal's home afterwards.