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Researchers at the University of Pennsylvania say they’ve discovered a way to circumvent the networking technology used by law enforcement to tap phone lines in the U.S.

The flaws they’ve found “represent a serious threat to the accuracy and completeness of wiretap records used for both criminal investigation and as evidence in trial,” the researchers say in their paper, set to be presented Thursday at a computer security conference in Chicago.

Following up on earlier work on evading analog wiretap devices called loop extenders, the Penn researchers took a deep look at the newer technical standards used to enable wiretapping on telecommunication switches. They found that while these newer devices probably don’t suffer from many of the bugs they’d found in the loop extender world, they do introduce new flaws. In fact, wiretaps could probably be rendered useless if the connection between the switches and law enforcement are overwhelmed with useless data, something known as a denial of service (DOS) attack.

Four years ago, the University of Pennsylvania team made headlines after hacking an analog loop extender device they’d bought on eBay. This time, the team wanted to look at newer devices, but they couldn’t get a hold of a switch. So instead they took a close look at the telecommunication industry standard — ANSI Standard J-STD-025 — that defines how switches should transmit wiretapped information to authorities. This standard was developed in the 1990s to spell out how telecommunications companies could comply with the 1994 Communications Assistance for Law Enforcement Act (CALEA).

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