A thousand years ago during my 9 month college hiatus/burnout recovery I cleaned carpets. Some jobs allowed us to simply put a price on what we'd do the work for- and they were nasty. Lucrative as he!!, but nasty.
One of the "special circumstance" cleanups was my very last- a '91 gulf vet swallowed a bottle of sleeping pills and tied a trash bag on his head. The manager of the apartment complex found him a week later... this was summer in Texas.
He was removed before I got there, but I was in "charge" of removing the carpet, redcanning it for bio, and disinfecting the joint and sealing the slab (seals the stink that WILL leak out over time).
Got as far as a walkthrough.
Point is, you'll never know. Ever. And that little slice of he!! was as terrifyingly nasty as you shouldn't imagine if you value sleep, and I'm sure the current resident has no idea.