If these numbers from a report about Prince’s fatal overdose are correct, if it is higher than 3 micrograms, the defense can simply argue there is no way of knowing if the fentanyl by itself was responsible.
The report says the concentration of fentanyl in Prince's blood was 67.8 micrograms per liter. The report explains that fatalities have been documented in people with blood levels ranging from three to 58 micrograms per liter.
What was the blood level?
If these numbers from a report about Prince’s fatal overdose are correct, if it is higher than 3 micrograms, the defense can simply argue there is no way of knowing if the fentanyl by itself was responsible.