Is it possible to find out the blood type by analysing the bite?

only if there was blood in the mouth of the bitter, and you got to it quickly... you'd probably have more look with DNA

There IS in almost all cases blood traces in Slava. By the NORMAL RUDEMENTARY processes of typing blood, from one bite there may not be enough traces to identify. High end lab work is VERY expensive.

For forensic purposes:
*The bite mark works as a fingerprint (the position of the teeth are different)
*You could probably extract DNA from the site (and could get information on blood group from that)
*You could of course call the person to the police station and draw some blood after witnesses testimony and get the blood type in that way.

But that's not the main thing I would want to know if someone bit me.
It's more intersting to know:
* what's the motive?
* if the biter is infected (Hep B,C HIV etc) - get profylaxis immediately!
* what punishment the person will get