casuist

Etymology
From, from , from.

Noun

 * 1)  A person who resolves cases of conscience or moral duty.
 * 2) Someone who attempts to specify exact and precise rules for the direction of every circumstance of behaviour.
 * 3) One who is skilled in, or given to, casuistry.
 * 1) One who is skilled in, or given to, casuistry.