ATLANTA, Georgia (CNN) -- It's happened again. A teacher is accused of having sex with a student and, like many times before, cell phone calls and texting reportedly had a role in sexually abusing a minor.

The same cell phones that parents buy as safety devices for their children are the gadgets that pedophiles and predators use to prep kids for sexual encounters, experts and police say.

The latest case is out of Pennsylvania. Police say a 26-year-old P.E. teacher admitted to having sex with a 14-year-old student in the school's parking lot.

Detectives from the Moon Township Police Department said they found nude pictures of Beth Ann Chester on the teen's cell phone along with text messages.

Chester faces 14 charges, including three counts of sexual abuse of a child and involuntary deviate sexual intercourse. Watch police describe how Chester explained the relationship »

Robert Del Greco, Chester's attorney, declined CNN's request for a comment. His client has a preliminary hearing on January 22.

Before cell phones, laptops and Sidekicks -- a BlackBerry-like device for the younger, hipper crowd -- someone might have noticed that a teacher was "grooming" a child, or being way too attentive, too often.

Not anymore.

Now, teachers have weeks, months and years to secretly undermine a child's parents and get a student to go along with sexual contact.