Why did they need to use an identikit to reproduce Makishima's face? I've been watching Psycho-Pass. Makishima has been working as an art professor at a women academy. During an investigation, an audio clip is retrieved where a girl (this particular case's culprit) speaks with him, mentioning his name. So now the investigators know that there is some guy called Makishima within the academy.

After a brief encounter between Tsunemori and Makishima, he escapes. Later, Tsunemori uses an identikit to relive the experience to reproduce his face. After the face is generated, they go to the academy and confirm that he was indeed a professor there.



To the left is the identikit image, and to the right what I imagine is the academy's archive photo. They compare them (wow, powerful hairspray) and they match.

But why an identikit? They already knew his name, so all they had to do was go to the academy and mention his name. Then they show the archived photo and Tsunemori would recognize it without having to relive the experience.
Actually Makishima didn't use his real name to register as a professor at Oso Academy but use his alias "Yukimori Shibata". Only one who knew the truth in the school is Rikako Oryo.