The PDF linked in the article claims that Fernandinho Beira-Mar, then the biggest drug boss in Brazil, was arrested after his location was found using triangulation.

[in Portuguese]

http://www.py2adn.com/artigos/Satelite-Bolinha.pdf

[translation below]

http://translate.google.com/translate?prev=hp&hl=en&...

But don't expect Brazilian police to bother looking for random truck drivers (unless they can bribe them).