PHOENIX -- When you send your kids off to school, you trust their safety and health are in good hands.

But CBS 5 found a danger on campus that's not only being overlooked, it is actually being sold every day to students.

Elementary and middle schools across the state just got rid of sugary sodas and junk foods last year to fight childhood obesity -- it's the law.

But what CBS 5 found for sale on some high school campuses is sending some kids to the hospital.

Energy in a can, it's a multibillion-dollar industry consisting of drinks that promise a boost of high-powered supplements and vitamins.

What the companies involved don't disclose is how much caffeine you're getting from the drinks.

CBS 5 had to go online to find the caffeine content. Reporter Nicole Crites found that a regular 12-ounce can of soda contains roughly 35 milligrams of caffeine.

Meanwhile, most energy drinks come in 16-ounce cans.

Crites said she found the following information on caffeine amounts per brand of energy drink in her online research:

Monster: 140 milligrams of caffeine.

Amp: 143 milligrams.

No Fear: 166 milligrams.

"That's like four cups of coffee," Crites said.

Doctors at Tempe St. Luke's hospital said they've seen more kids coming into the emergency room with caffeine overdoses as younger students slam the popular energy drinks, eager for an edge.

"We're seeing more and more of it," Dr. Jack David, of Tempe St. Luke's, said. "These amounts [of caffeine] are not made for children."

One parent, who only wished to be known by his first name, Kurt, said he had no idea his son's high school sold energy drinks.

Kurt said that the school's nurse called after his freshman son drank one he got from a friend during lunch.

"He said he felt his chest pounding and he felt short of breath," Kurt said. "He said that he felt a squeezing sensation in his chest, that he felt like he was going to die."

The Chandler father is also a paramedic, so he knows the classic warning signs of cardiac arrest.

Kurt also knew his son was even more at risk, being that his son is taking prescription medications for attention deficit hyperactivity disorder.

"There's no way for the school to know how many kids, or exactly who, are taking medications," Kurt said.

Heart surgeon Dr. Grayson Wheatley of the Arizona Heart Institute said that up to 5 percent of kids have unknown or undiagnosed heart problems.

He also said that drinking even one of the super-powered energy drinks can trigger anything from high blood pressure to heart attack.

"Anytime we talk about heart disease, even in children, we're talking about potential for serious outcomes here," Wheatley said.

Kurt said that there's no excuse for the drinks being allowed on campus. He said to refer to the "not reccomended for children" warning label on the cans.

"I actually sat down with one of the assistant principals and addressed my concerns," Kurt said. "And I was told that it would be looked into."

CBS 5 called Basha High School, where Kurt's son attends, and the Chandler Unified School District, and were assured that none of the schools in the district sell energy drinks.

Kurt was sent to campus with his cell phone camera and took pictures of the energy drinks for sale.

It was not until CBS 5 called back armed with the photographic evidence that the prinicpal promised to pull the energy drinks off the shelves.

"I think that parents out there need to be aware that their kids may be in danger, too," Kurt said.

State legislators are backing a bill that would extend the ban on sugary sodas and junk foods to high schools.

Some disticts, such as the Phoenix Union District and Gilbert and Scottsdale districts, have already banned them from vending machines and high school campuses voluntarily.