The Toxicology Report
The toxicology report of Kurt Cobain stated that 1.52mg per litre of morphine along with traces of valium (diazepam) were found in his blood. Tom Grant claims that the amount of heroin found in Cobain's blood is 3 times the lethal dose. His claim is based on a study from a book called Heroin Addiction by Jerome J. Platt where the author wrote that the maximum lethal dose of a 150 pound male would be about 75mg-80mg of heroin. This will result in 0.5mg per litre of morphine in blood. According to Grant, Cobain was injected with minimum 225mg of heroin to get 1.52mg/L of morphine in his blood. From what I have researched, there is no fixed lethal dose. How much of a dose would be lethal depends on various factors such as the age, gender, health and drug tolerance of the individual. For those who are new to heroin and have never taken the drug before, 75mg of heroin may be a lethal dose for them. However, addicts take the drug regularly and they build a tolerance allowing them to