Police were alerted after officials at an Omaha elementary found what appeared to be marijuana in a third-grader’s backpack, but officers determined the substance was catnip.

Omaha Public Schools spokesman David Patton says administrators at Miller Park Elementary called police Friday to report the substance found in a bag.

Officer Michael Pecha says when police arrived, they determined it was catnip, not marijuana.

The school principal says the student told authorities he found the bag on his way to school.