Sherr, MicahCronin, EricClark, SandyBlaze, Matthew A2023-05-222023-05-222005-11-012006-02-28https://repository.upenn.edu/handle/20.500.14332/6261Many law enforcement wiretap systems are vulnerable to simple, unilateral countermeasures that exploit the unprotected in-band signals passed between the telephone network and the collection system. This article describes the problem as well as some remedies and workarounds.Article