Being a true crime fan for a long long time it's always been something we are told that its really hard to stab someone without hurting yourself also, and that It would be near impossible to stab 4 people to death without doing some noticeable damage to yourself also. Do we have any doctors/pathologist/corner or forensic experts that know if this is actually true or just something you hear on TV shows.
If this is true then I wonder why they are not asking people about 'do you know anyone that suddenly turned up with injuries to their hands' etc. seems like something I would be doing if the above is true. if it is not and it is possible for a skilled person who is careful to stab 4 ppl to death without injuring themselves then nvm.