updated 1/16/2012 10:53:01 AM ET 2012-01-16T15:53:01

An Austrian high school principal narrowly escaped legal action after going after potential exam cheaters with a high-tech — but illegal — idea.

Gerhard Klampfer reportedly bought and mounted a jamming device strong enough to prevent graduating classes from doing Internet research on their smartphones during final exams last summer.

State broadcaster ORF said on its website Monday that the move was effective enough to arouse the attention of a phone service provider. The company alerted authorities in charge of monitoring radio traffic after noticing lack of service.

They then notified legal officials who threatened Klampfer with a misdemeanor. Under Austrian law, only police, the military and others in charge of security can jam signals.

Klampfer says he didn't know he was breaking the law. Instead of a fine, he was let off with a warning.

Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.


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