He met with large and small groups of students – and even some parent groups -- invited there by school officials alarmed by the activity taking place.He told the students that just receiving an image – and not erasing it immediately – is a four-year felony.

Considered child sexually abusive activity, those who create images could potentially serve 20 years in prison.

"Kids have no clue what they're doing and it's becoming very prevalent," said Muskegon County Chief Assistant Prosecutor Timothy Maat. Hilson said his office has received multiple referrals from schools regarding teens who are sexting.

"It's become an epidemic." Teens are sharing sexually explicit images in alarming numbers – so alarming that school officials have turned to law enforcement officials for help controlling what students are looking at in their school hallways. He couldn't put a number on them, but said those who come across his desk – that school officials even find out about – are just the tip of the iceberg.

"I think this activity is probably more prevalent than we even realize," Hilson said.

In 2012, 20 percent of high school students reported having sent a sexually explicit image of themselves, while 40 percent had received one, according to a study by researchers at the University of Utah and the University of Minnesota.

Two years later, a study by Drexel University in Philadelphia found that 30 percent of students said they had sent sexual images while they were minors.

Some researchers believe that sexting may be part of the "new normal" in sexual development among adolescents. 'Fun or flirtatious' Hilson spent much of the past school year on a campaign to inform high school and middle school students of the dangers of sexting.

MUSKEGON COUNTY, MI – A girl is ostracized from her athletic team after she sends nude pictures of herself to teammates' boyfriends, as well as other boys at her high school.

A videotape of three students engaged in sex inside their high school spreads like wildfire among their classmates.