More on the Philly school Mac controversy
"While certain rules for laptop use were spelled out ... there was no explicit notification that the laptop contained the security software," McGinley said. "This notice should have been given, and we regret that was not done."
The district's Web site said 42 activations of the system resulted in the recovery of 18 computers.
McGinley said the district had hired former Henry Hockeimer Jr., a former federal prosecutor, to review past practices and suggest improvements.
The FBI is looking into whether federal wiretap or computer-intrusion laws were violated, according to an official who spoke on condition of anonymity.