I wonder about cuts on somebody's hand,
provided the murderer didn't wear gloves.
It happens that a stabber sometimes injures oneself while attacking.
"In a knife attack the perpetrator can unintentionally injure his own hand,
if the knife does not have an adequate handguard
and the tip of the blade hits a solid, mostly bony structure
while being violently thrust into the victim's body."
In a knife attack the perpetrator can unintentionally injure his own hand, if the knife does not have an adequate handguard and the tip of the blade hits a solid, mostly bony structure while being violently thrust into the victim's body. The injuries occurring under these conditions are...
pubmed.ncbi.nlm.nih.gov