Did wastewater drug monitoring for a while, and the annoying bit was fentanyl metabolites sitting near the detection limit, so absence isn't proof.
Either way, the constipation would affect different users at different times, so I don't think it would matter to the data. In other words, your idea stinks ;)
hnrprtlpdb · · focus · HN ↗
artisinal · · focus · HN ↗
There isn't anything to measure if the poop is unable to leave the end-user.
rithdmc · · focus · HN ↗
Either way, the constipation would affect different users at different times, so I don't think it would matter to the data. In other words, your idea stinks ;)
artisinal · · focus · HN ↗
astura · · focus · HN ↗