staged crime scenes

 
STAGED CRIME SCENES
You arrive at the scene and observe the nude body of a young woman lying on the floor next to the tub in the bathroom. The tub was half full of water, and the body was still wet, as though it had been submerged. The husband, who was distraught and crying, stated to the police that he had found his wife submerged in the tub upon returning to the apartment. He had pulled the body from the tub and had attempted mouth-to-mouth resuscitation. He also added that his wife had been despondent and had probably committed suicide by taking an overdose of pills and drowning herself in the tub. Officers at the scene had recovered a prescription bottle next to the victim.

You examined the body and noticed a slight bruising in the neck area. The husband explained that upon finding his wife submerged in the tub he had attempted to resuscitate her and had held her by the throat to force air into her lungs.
What are some things (physical, testimonial, and circumstantial evidence) you would look for to determine whether you have a suicide or a murder?

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