'Devious Defecator' case is a landmark for US genetic-privacy law
nature.com
nature.com
I couldn't resist
You can be fired for doing something that does not break a law. Police are restricted to investigating cases where a law is broken.
Apparently there was both DNA and CCTV evidence in the case.
"The law does include limited exemptions, however. Forensic laboratories can ask workers for their DNA to check that employees' genetic material does not contaminate the genetic samples that they analyse."
There were a series of serial shower poopings that happened at Twitter several years ago. The perpetrator(s?) were never caught.
She must be a Nancy Drew/Hardy Boys fan.