In the year since Parkland there's been a school shooting, on average, every 12 days
Updated 2034 GMT (0434 HKT) February 14, 2019
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(CNN)In the year since a troubled teen gunned down 17 people at Marjory Stoneman Douglas High School, shootings have continued at schools across America.
- Shooting must involve at least one person being shot (not including the shooter)
- Shooting must occur on school property, which includes but is not limited to buildings, fields, parking lots, stadiums and buses
- We included gang violence, fights and domestic violence, but our count is not limited to those categories
- We included the accidental discharge of a firearm as long as the first two parameters are met -- except when the sole shooter is a law enforcement or security officer