A "Andreas Fink" wrote about the internet and the police in 2013.

https://www.fink.org/blog/internet--police.html

"2000 - 2001: Cisco Systems San Jose: Field engineer for SS7/VoIP field trials. Signalling expert"

I think it's the same person. He has been in a local parliament for the Swiss pirate party. So he's well aware of the misuse. But he offers the services commercially.