(at around 9 mins) Garret and Peter are discussing the fact that the levels of THC had stopped showing up in the dead man's hair at about 2.5 inches from the scalp meaning that he had stopped using marijuana prior to his death. Peter said that hair grows at about "a quarter of an inch per month" and Garret agrees saying that the dead man had stopped smoking "about 10 months ago". But human hair normally grows an average of about .5 inches per month meaning that either the dead man stopped using marijuana only about 5 months ago or the THC levels ended at about 5 inches not 2.5.