Some school districts across the United States received settlement money from Juul, the company that makes electronic cigarette products, and used that money to buy vape-detection systems.

Fresno’s three largest school districts — Fresno, Clovis, and Central — didn’t get any part of the $1.7 billion Juul settlement but are proceeding with anti-vaping efforts nonetheless.

Fresno Unified installed sensors last spring at eight pilot sites, and they went operational at the beginning of this school year, spokeswoman AJ Kato said. District officials are still collecting data and don’t have anything to report yet, she said.

Central Unified tested vaping detectors in some schools but found that active supervision by campus safety liaisons was more effective, district spokesperson Olegario Tapia Solis said.

“We believe that a more hands-on approach allows us to better monitor and address vaping incidents on campus,” Tapia said. “As a school district, we are concerned about both the health dangers of vaping and the disruption it causes in our schools. Frequent fire alarms triggered by vaping not only disrupt learning but also pose a risk of desensitizing students and staff to actual emergencies.”

The district is gathering data on vaping incidents to better grasp how widespread it is and how the district should strengthen its response, he said.

Clovis Unified installed vape sensors at its secondary schools, but spokeswoman Kelly Avants said she did not immediately have information on whether or how the district is tracking reported incidents.