The researcher finds a lot of articles about the famous cop having tampered with the evidence related to the arrests that he made.<br/><br/>or <br/><br/>The researcher finds a lot of articles about the famous cop having tampered with the evidence related to the arrests that he had made.<br/><br/>or<br/><br/>The researcher finds a lot of articles about the famous cop having tampered with the evidence related to the arrests that he has made.<br/><br/>Which one is correct and why?