Article updated: 5/13/2013 1:37 PM

How DuPage forest officials discovered scam

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Arif Mahmood, left, Mark McDonald and David Tepper all face charges after the DuPage County Forest Preserve District helped uncover what prosecutors are calling a series of "elaborate" schemes.

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Two former administrators charged with scamming the DuPage County Forest Preserve District out of more than $150,000 avoided suspicion for years, officials say, until their loyalty to a vendor seeking a computer contract triggered an internal investigation so secret that only three district officials knew about it.

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