"Oh," Lieutenant Chang said, sounding rather downhearted, "tag mites 
are not very reliable. The perpetrators took certain precautions to prevent the 
mites from attaching. Of course, several mites attached themselves to the 
victim. But before we could track him, he made his way to New Atlantis Clave, 
where your superb immune system destroyed those mites. So his identity has 
remained a mystery." Chang reached into his breast pocket and pulled out a 
folded sheet of paper. "Mr. Hackworth, please tell me whether you recognize 
any of the figures in this clip."