First, what about this is confusing? Did you look at the Stanford web site?
http://admission.stanford.edu/application/freshman/testing.html
Applicants must self-report and submit all SAT scores and all ACT scores. Applicants may not use the College Board’s Score Choice feature or “hide” any scores with either testing agency. The only exceptions are tests taken for the purpose of talent programs in middle or junior high school (for example, Johns Hopkins Center for Talented Youth and Duke University’s Talent Identification Program). These test scores do not have to be sent to Stanford.
Stanford recognizes that the ACT charges a fee for each score report. If the cost associated with the submission of all ACT scores presents a financial hardship, you may simply send one score report and self-report the remainder of your ACT scores. All official scores will be required if you are offered admission.
You don’t have to send in tests taken for TIP.
If you “purge” scores and the school hears about it then you’ll be denied admission. If found out later you will be rescinded or potentially dismissed if you’re already a student.