NATIONAL--  You've probably heard of drug testing for marijuana and hard drugs before but have you heard of testing for nicotine?

Several labs across the u.s. are now testing kids for nicotine as a way to see if they are vaping. Vaping is a trend that is sweeping across the United States that federal health officials are calling an epidemic.

The popular brand Juul has more nicotine on one cartage as an entire pack of cigarettes.

These vape tests can cost anywhere from 70 to 120 dollars and they test for exposure to nicotine. One lab in Atlanta says that many concerned parents are testing their children who are as young as 12 years old.

Lacretia Waller a lab manager says, "if someone is using nicotine we can test their urine, hair, blood. Hair, we can go back to 90 days and that's because we're taking the follicle."

A couple of caveats about these tests. Kids that have chewed nicotine gum or breathed in second hand smoke can return positive results. Also, not all vapes contain nicotine and those won't show up on a test.