"My son's school is holding 4 active shooter drills this year. The only clear impact of these drills is stress, anxiety and confusion on the part of children and families. I would end the drills or make them optional. Let our kids learn the right things," Yang tweeted Monday.
Oakland University said using the discs is a last resort but could still cause "quite the distraction."
Local police responded to reports of an active shooter in the community of Hampstead, North Carolina.
"There have been 22 school shootings in the U.S. since the beginning of this year. Why would anybody think it's a good idea?"
Santa Fe Police said officers are on the scene at the high school.
After the Parkland, Florida, school shooting, school violence incidents have increased dramatically.
The massacre is the worst in Texas's history.
As mass shootings become more common, the FBI has endorsed a training program for first responders—one that recommends civilians keep their guns holstered.