I think that is more common than we think. The drug user uses the same dose from two years ago and does not have the same tolerance and so overdose.And in other local news...
Maybe some of you recall back in 2016 when DH interrupted a burglary at the course and the 2 guys involved were sent to prison. One of them was just released on parole. The first thing he did was get high and overdosed.
(This is such a weird place.)