Neither is correct. Context might make a difference here but I can see no reason not to use the standard "staff fraud". "Fraud" there is used as a collective noun to cover all the fraud being referred to.
There was no reason to capitalise "frauds" in either case. However, you do need to capitalise the word "I" every time you write it.
Please also note that I have changed your thread title. Titles should include some or all of the words/phrases you are querying. Using your username or things like "help with sentence" is unhelpful.
Student or Learner