Welcome back. Tonight, the sexting scandal one Colorado high school, involving hundreds of racy pictures. We're finding out how students kept the pictures hidden with some sneaky smart phone apps. Here's Clayton Sandell. Reporter: Tonight, the small town of canyon city, Colorado, is reeling from a sexting scandal. Authorities believing it may involve over 100 students. Are there adults involved? What's going to happen? How far is it going to go? Reporter: Officials say it involves kids as young as middle schoolers to high school football players. The school superintendent says they used smartphone apps to try to keep the pictures hidden. The main source of transfer of these pictures as best we can ascertain is an app called photo vault. Reporter: The program can hide as other apps. Typing in a secret code allows access to hidden content. Authorities say they have confiscated three cell phones and are now seeking search warrants. We do have a telephone with several hundred images on it. Reporter: Even parents of students not involved are concerned. This 16-year-old wants the school to move past the scandal. They're just scared. They don't want this situation to define them. Reporter: Authorities are considering suspensions, expulsions, and some may face felony criminal charges. A conviction would force them to register as a sex offender. And authorities here say it could take them more than a month to figure out whether students will face these serious charges. And they say they will only file them if absolutely necessary. Tom? Thank you.