Clear bags among security measures at school where 17 died

Marjory Stoneman Douglas High School students arrive back to school after spring break without backpacks, Monday, April 2, 2018, in Parkland, Fla. Students at the Florida high school where 17 people died in a mass shooting are receiving clear backpacks. (Joe Cavaretta/South Florida Sun-Sentinel via AP)
Marjory Stoneman Douglas High School students arrive back to school after spring break without backpacks, Monday, April 2, 2018, in Parkland, Fla. Students at the Florida high school where 17 people died in a mass shooting are receiving clear backpacks. (Joe Cavaretta/South Florida Sun-Sentinel via AP)
Marjory Stoneman Douglas High School students arrive back to school after spring break without backpacks, Monday, April 2, 2018, in Parkland, Fla. Students at the Florida high school where 17 people died in a mass shooting are receiving clear backpacks. (Joe Cavaretta/South Florida Sun-Sentinel via AP)
Marjory Stoneman Douglas High School students arrive back to school after spring break without backpacks, Monday, April 2, 2018, in Parkland, Fla. Students at the Florida high school where 17 people died in a mass shooting are receiving clear backpacks. (Joe Cavaretta/South Florida Sun-Sentinel via AP)

Clear bags among security measures at school where 17 died

Marjory Stoneman Douglas High School students arrive back to school after spring break without backpacks, Monday, April 2, 2018, in Parkland, Fla. Students at the Florida high school where 17 people died in a mass shooting are receiving clear backpacks. (Joe Cavaretta/South Florida Sun-Sentinel via AP)
Marjory Stoneman Douglas High School students arrive back to school after spring break without backpacks, Monday, April 2, 2018, in Parkland, Fla. Students at the Florida high school where 17 people died in a mass shooting are receiving clear backpacks. (Joe Cavaretta/South Florida Sun-Sentinel via AP)
Marjory Stoneman Douglas High School students arrive back to school after spring break without backpacks, Monday, April 2, 2018, in Parkland, Fla. Students at the Florida high school where 17 people died in a mass shooting are receiving clear backpacks. (Joe Cavaretta/South Florida Sun-Sentinel via AP)
Marjory Stoneman Douglas High School students arrive back to school after spring break without backpacks, Monday, April 2, 2018, in Parkland, Fla. Students at the Florida high school where 17 people died in a mass shooting are receiving clear backpacks. (Joe Cavaretta/South Florida Sun-Sentinel via AP)