Consider half life during drug detoxification
A young man on my sobriety-based detox program (only after showing positive for opiates) admitted to heroin-usage, but hedged the matter saying it was “5 days ago.” His implicit presumption was that an isolated episode, days ago — compared to continuous, more recent, heroin-usage — would lessen the likelihood of his getting kicked off the program.
Is his story of “no heroin [ingestion] in the last five days,” likely, the whole …