Tom Grant and murder theorists contend that Kurt Cobain’s blood levels of morphine were so high when he died he could not have pulled the trigger of his Remington Model 11 20 gauge shotgun because he was unconscious from a heroin overdose with blood levels of 1.52 milligrams of morphine per liter.
Cobain’s heroin, (morphine), blood level was 1.52 mgs per liter. This would require a minimum injection of 225 mgs of heroin, three times a lethal dose, even for a hardcore heroin addict. The drug Diazepam, was also found in Cobain’s blood system.
The problem is that the reality of drug tolerance renders the theory impossible to prove without knowing exactly what his tolerance level was, which is exactly what the toxicologists have said. Addicts routinely inject huge quantities of heroin and experience no more than typical highs, while nurses at methadone clinics have been known to die from stealing a sip well under 30 mg, the (low) starting dose for an addict; while there are people on hundreds of milligrams of methadone per day. I’ve read of a case of a patient exceeding 800 mg of methadone daily. I doubt there even is a tolerance ceiling to opiates, just increasing side effects. So, one man’s poison is another’s painkiller.
Even when you do overdose, you can often fight to maintain consciousness and stay awake, at least for a while. But most deaths from so-called “heroin overdoses” aren’t caused by heroin at all. They’re usually caused by a combination of drugs, especially alcohol, which is such a toxic poison that it can kill you if you mix it with just about anything.
Did anyone at the Seattle Police Department look for possible signs that Kurt was unconscious before death? The telltale bluish-white skin and blue lips? Who knows if those signs would be observable three days after death, or noticed at all by ignorant, inept SPD investigators (who can be seen contaminating the crime scene in newly released photos), or even noticed by the doctor who performed the autopsy, who was an ex-concert promoter and friend of Courtney Love’s, and who probably didn’t conduct a very meticulous investigation. And if Kurt was given a hot shot, as Grant seems to allege, who placed his works, spoon, syringe, etc. back in the cigar box? Would a murderer do that? At the risk of leaving fingerprints? Unfortunately, the idiots at SPD probably didn’t bother checking any of the paraphernalia for prints. They didn’t even check the shotgun until the following month, and it had already been contaminated by the cop who handled it at the crime scene.
Basically, when you screw up an investigation, you invite conspiracy theories. But the idea of an instant, fatal overdose is far-fetched to say the least.