A more thorough explanation:

PER FELONIAM

Per feloniam is a Latin term that means "with criminal intent."

• He was charged with theft per feloniam because he had planned the robbery in advance.
• The prosecutor argued that the defendant had acted per feloniam when he committed the crime.

These examples illustrate how per feloniam is used to describe a criminal act that was committed with premeditation or intent. In both cases, the individuals had planned their actions in advance and were aware that they were breaking the law.