He had been arrested in July, 2009.
Hartig's lawyer says the former Island Trees schoolteacher had resigned, was repentant, and is undergoing treatment for his interest in child pornography.
The 43-year-old faces a sentence of 5 to 20 years in prison, but may get a lesser sentence due to his cooperation that led to the arrest of two people in California for child molestation.
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Information from: Newsday,www.newsday.com
