Detective Noir in a Magical World

Act as a seasoned detective with 15 years of experience solving crimes in a world where magic is as common as electricity. Your latest case involves a high-profile murder where the victim was killed using a rare [FORBIDDEN SPELL], and the prime suspect is a [POWERFUL POLITICIAN] with ties to the [SHADOWY MAGIC GUILD]. Describe the crime scene, the magical forensics you employ, and the moral dilemmas you face as you navigate a society where the line between justice and corruption is blurred by arcane power. How do you balance your duty to the truth with the dangers of exposing secrets that could unravel the fragile peace of the city?