With 100 detect hidden I can't reveal another player that only has JOAT hiding and stealth, even while standing next to the player. This should be 100% chance. I tried this in Felucca both inside dungeon and outdoors. Then I went a step further and got out an elf character, which couldn't passively detect the JOAT either, while attempting for a length of time. Elves are suppose to be harder to track and are granted a larger passive detect field. Since this BUG seems to go unnoticed because its relationship to unpopular game play styles and character templates I would strongly recommend verifying the mechanics scripted for Tracking as well, not to mention the Racial advantage/disadvantages associated with this.
