Mr. Corbel - You may want to brush up on the 5th amendment yourself. 
This article may also help you to understand why this particular pardon is likely illegal.
https://www.washingtonpost.com/blogs/right-turn/wp/2017/08/30/legal-challenge-to-arpaio-pardon-begins/?hpid=hp_no-name_opinion-card-b%3Ahomepage%2Fstory