Obstruction of Justice or Harbinger of Transparency?

Warn Criminals Before Police Arrive?

Could a mobile phone app be illegal if it warned users of police activity like a speed trap or a drug bust? "Obstruction of Justice" is the crime of intentionally doing something to impede or hamper a law enforcement activity or an official investigation.

South African legal authorities are taking legal action against a Twitter tweeter who warns motorists about speed traps: http://tech.slashdot.org/story/10/09/19/0110246/Criminal-Charges-Against-Speed-Trap-Tweeter

Swiss authorities have outlawed certain GPS devices that alert drivers of speed traps. http://www.techdirt.com/articles/20070212/075138.shtml

The trend is for technology to shed more light and scrutiny on all police activities. Police must learn how to operate in a transparent world. http://hack-igations.blogspot.com/2007/12/people-in-authority-sometimes-abuse.html

This mobile device app that tells motorists about upcoming road conditions:
"traffic information based on the wisdom of the crowd"
- Free GPS Navigation with Turn by Turn - Waze | 
Update:   For more on mobile apps that might contribute to the crime of "obstruction of justice," seehttp://technolog.msnbc.msn.com/_news/2011/05/25/6704362-police-on-radio-scanner-apps-thats-not-a-10-4
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