Primomo on Friday ruled that Dennis Joseph Jasso would have to remain jailed until a bail hearing Wednesday.
Jasso, 34, was indicted by a federal grand jury on Wednesday on two counts of distributing child pornography and one count of possessing it. The San Antonio Express-news reports that FBI agents arrested Jasso Friday and the indictment was unsealed the same day.
One of Jasso's lawyers, Bobby Barrera, said he had not received any of the evidence and that, in some cases, those in the images might turn out to be of legal age.
Jasso taught at Sam Houston from August 2006 through May 2007, and was an assistant band director, said Melissa Matthews-Woolard, spokeswoman for the San Antonio Independent School District.
She said Jasso isn't suspected of any improprieties with any of the students.
Distributing child pornography carries a punishment of five years to 20 years in prison. Possessing it is punishable by up to 10 years in prison.
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