An MIT lab flushing out a city’s secrets
theguardian.com
theguardian.com
But of course then we will have stool-privacy defenders that will combat authorities so we can keep our intestinal activity private and un-spied at.
Imagine the owner/worker of a hotel where {insert famous person name} stays, (s)he could potentially sell that person's sewage-test (directly from the bathroom pipes), to journalists or someone else. Haha.