A Franklin Square man who taught music for 38 years in several Long Island school districts before retiring was arrested Tuesday on child pornography charges, officials said.

David Kopstein, 68, who taught in the West Hempstead and Port Washington school districts, was charged with posting child pornography on the Internet.

He was arraigned in federal District Court in Central Islip and was held pending future bail hearings by U.S. Magistrate Gary Brown. He was not required to enter a plea.

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Kopstein retired from teaching in 2009 and he is not accused of abusing any students, officials said. He also played trumpet with a number of bands on Long Island and donated his time to sound "Taps" at military funerals, according to various interviews he has given about his musical career.

Kopstein's son, Scott Kopstein, also of Franklin Square, was arrested in 2009 and is serving a 5-year sentence in federal prison on child pornography charges.

David Kopstein told Department of Homeland Security agents who arrested him Tuesday "that he continued to look at child pornography sites a couple of years after his son had been arrested, [and] he did not know why he started but he knew it was wrong and illegal," according to a complaint filed by Eastern District federal prosecutor Allen Bode.

When his son was arrested in 2009, David Kopstein told federal agents he had discovered child pornography on a computer that he and his son shared, found it "disgusting" and he deleted it after his son failed to do so, according to court papers.

Kopstein told the agents at the time that his son lied to him when he asked where he got the images. The son told him that the pornographic images were attached to games he had taken off the Internet, according to the complaint.

Scott Kopstein was initially convicted on charges of transporting child pornography in 2011, but the conviction was reversed because of an improper jury instruction. He pleaded guilty before a new trial and was sentenced to the 5-year term in February, according to court papers.

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David Kopstein's attorney was out of town and could not be reached for comment. Federal public defender Tracey Gaffey, who represented him at Tuesday's hearing, declined to comment, as did prosecutor Bode.

Kopstein faces a mandatory minimum sentence of 5 years in prison if convicted.