A Wisconsin religious school system is considering a drug testing policy for its teachers after a teacher's aide was arrested for allegedly having heroin delivered to her at the preschool where she worked.

Kiley Cirillo, 20, of New Berlin, Wis., was arrested for drug possession after a fellow teacher found used needles, white residue and a bottle of pills in a package Cirillo's friend delivered to her at Hales Corner Lutheran Preschool in May, police said.

Cirillo had texted her friend to drop off the package at the school while Cirillo was at work, according to a police report filed in the New Berlin Police Department.

The white residue, according to the police report, was heroin.

Hales Corner Lutheran School administrators are investigating the incident.

"We conducted all the background screenings that are required by the state," said Mark Steinbrenner, the business manager of the Hales Corner Lutheran Church, which oversees the preschool, elementary, middle school and high school in its network.

"We are looking at possibly instituting drug testing. We have a risk policy advisory meeting that will discuss this issue soon.

"We are doing everything we can to protect our children," Steinbrenner continued. "All of the families whose children go to our schools have been very understanding. We are praying for Kiley and her family. This must be a very difficult time for them."

Cirillo did not answer repeated calls for comment. Neither police nor court records indicated whether she had an attorney, and it's unclear when she was arrested. She has not yet entered a plea and will appear in court July 15.