CUMBERLAND COUNTY, NJ — A custodian who filmed himself performing sexual and crude acts on school grounds began endangering children well before boasting about his actions to a group chat, prosecutors said Thursday at his detention hearing.

A judge granted the state’s request to keep Giovanni Impellizzeri in jail. The Upper Deerfield Township school custodian was accused last week of tainting cafeteria food with bleach and his bodily fluids. He was also charged Wednesday with child pornography offenses.

Impellizzeri shared posts and videos of his crude actions at the Elizabeth Moore School to a digital group chat with more than 1,000 people, according to Lindsey Seidel, an assistant Cumberland County prosecutor.

Impellizzeri recorded the videos on three separate dates between Oct. 26-30, prosecutors said. But he posted in the chat about getting away with those actions before, according to Seidel.

“He says (in the group chat), ‘I’m a custodian, so I’m alone in the building a lot. But honestly, I go in the kitchen and rub all their shit on my ass while the building is full of people,’” Seidel said.

The nature of the group chat — on Telegram, an encrypted-messaging service — remains unclear.

The school district has placed Impellizzeri on administrative leave.

Impellizzeri, 25, also shared a post in which he urinates in a tanning booth, revealing that he’s performed such actions in public locations outside of school property, Seidel said.

“If I have to piss, I just go wherever. Someone else can clean that shit up. It’s not my problem,” said one post from Impellizzeri, as read by Seidel.

Impellizzeri has been detained in the Cumberland County Jail since Oct. 31, when he was initially charged. The public defender representing Impellizzeri contended that he’s been diagnosed with and treated for mental illness for a lengthy period of time.

The attorney, Emily Bell, said Impellizzeri should be subject to strict pretrial monitoring, rather than jail, so he could continue treatment that the court could modify.

“I am working on getting all the records for those things, but he’s been treated for a long period of time,” said Bell, of the state public defender’s office. “I think that needs to be recognized.”

But the judge reasoned that Impellizzeri successfully concealed his actions for a long time before sharing his conduct with the group chat. Therefore, a significant amount of home monitoring wouldn’t eliminate the risk he poses to the public, according to Judge Cristen P. D’Arrigo.

“He was able to hide his conduct not only from his employer but apparently from whoever was treating him,” D’Arrigo said. “Whatever mental-health treatment he was receiving was apparently ineffective.”

The detention hearing was scheduled before Impellizzeri was charged with distribution and possession of child pornography. But those allegations came up several times in the proceeding.

Authorities found the explicit material on Impellizzeri’s phone after his initial arrest for the actions on school property, Seidel said. They found one video involving an infant and another with prepubescent boys, according to prosecutors.

Detectives determined that he shared at least one of those videos in October, Seidel said.

Seidel outlined several screenshots with posts and videos that Impellizzeri allegedly shared with the group chat.

In one post, Impellizzeri showed his hand in a basket of cucumbers. According to Seidel, he stated, “Honestly, I’ve put bleach in their food before. They were fine, just a little sick. Oh well, not my problem.”

Impellizzeri — a self-described satanist — also mentioned that he previously stuck feces in taco meat and nobody knew the difference, Seidel said.

In another post, Impellizzeri “indicates that doing these sorts of things is a sexual fetish of his,” Seidel said. “And he indicated that it got him aroused, so he started masturbating onto the pillows at the school.”

According to Seidel, he told the group, “Don’t encourage me. I do enough fucked up shit, believe me.”

Impellizzeri is next scheduled to appear in court Dec. 14 for a pre-indictment conference.