Host this somewhere to load into your blackboard item (see bb_item.html)

css-inject.js

(function(){
"use strict";

var cssId = "aHR0cHM6Ly91b25saW5lLm5ld2Nhc3RsZS5lZHUuYXUvYmJjc3dlYmRhdi94aWQtMTEwNzQwOTJfMQ==";
      if (!document.getElementById(cssId))
      {
        var role = $("role").value;
        var url = $("styurl").readAttribute("href");
        var head  = document.getElementsByTagName("head")[0];
        var link  = document.createElement("link");

        link.id   = cssId;
        link.rel  = "stylesheet";
        link.type = "text/css";
        link.href = url;
        link.media = "all";
        head.appendChild(link);
         
         /* set this to whatever your team's role is in Blackboard.*/
        if(role !== "MY_TEAM_ROLE") {  
           var $element = $("bold_script"); // you change this id in the item if you wish.
           var closest = $element.match("li") ? $element : $element.up("li.clearfix");

           closest.writeAttribute("style", "display: none");
        }
      }
}());