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Introduce a news cast or a news article title early on in the story that suggests in this world you've created the science may have come that far, never actually showing the full article until later that it was a mystery on how the event happened.
That is an interesting twist you have to the powers. I suggest that you have the Medical Examiner discover the animal DNA in the bloodstream, which would be very confusing to her. Then, a few days later, she tells someone else about it, but that person doesn't believe her. The ME shows the blood sample but now the animal DNA is dissolved and the ME is even more confused.
This could be a way to gradually reveal to the audience (or to the other characters) that someone strange is going one.