It also implies that either the blood was taken within 30 minutes of inhalation or they are measuring something else entirely.
Post mortem diffusion can happen, in either direction. Unless the individual died while smoking, there would have been ample opportunity for the drug to distribute within the bloodstream that could allow post mortem diffusion.
Unless the numbers I have for the blood stream decay rate are completely wrong a number as high as 30.7 seems like an extraordinary claim requiring extraordinary evidence.
I saw a rate of 46% of car crash fatalities are within 30 minutes of the moment of impact. Unless they are only considering the subset of immediate deaths, I would be very sceptical of their numbers.
