This is Ask an Expert, where every weekday at 9:20am on KCBS we're giving you direct access to top experts in various fields.

We're continuing to follow the deadly school shooting in Wisconsin. We now know that the assailant was a teenage girl. She open fired at the Abundant Life Christian School yesterday, and investigations into what prompted this fatal incident are underway.

For more on this, KCBS Radio news anchors Margie Shafer and Steve Scott spoke with Scott Poland, psychology professor and co-director of the Suicide and Violence Prevention Office at Nova Southeastern University. He's an expert on school safety and school crisis prevention.