PHOENIX —  An investigation into a heroin bust has broadened to at least 150 teenagers, according to Maricopa County (search) Sheriff Joe Arpaio.

Some of the teens may have bought or used on the campuses of several Scottsdale schools, authorities said.

Arpaio said Thursday that his office has turned up the names of at least 150 Scottsdale students among more than 40,000 cellphone calls made to suspected drug dealers Jose Hernandez Jimenez, 21, and Cesar Rodriguez Perez, 18.

But Arpaio said arrests may not be made in every case.

There have been no arrests since the August sting, which netted 16 Scottsdale students as well as the suspected dealers, who were booked Aug. 17 into the county's jail on drug-related charges.

The sheriff's office originally believed dealers targeted Saguaro, Desert Mountain and Chaparral high schools, but the investigation has since turned up more public schools in Scottsdale and one alternative learning center were possibly involved.