CAUSED A SHIFT IN PERSPECTIVE FOR SOME STUDENTS. >> IT'S THE FIRST DAY BACK AT SCHOOL FOR STUDENTS AT NORTHWEST HIGH SCHOOL YOUR NEIGHBORHOOD. REPORTER JOHN BROWN AND PARENTS AND STUDENTS. I TALKED TO SAY THEY FEEL NERVOUS GOING BACK U.S.. >> NORTHWEST HIGH SCHOOL STUDENTS RETURN TO CLASS THURSDAY. BRITAIN BEING ARRIVED WITH HIS MOM. JESSICA, WE JUST NEED ANSWERS YOU KNOW. >> HOW THAT COULD HAVE EVEN HAPPENED. >> I FIRST JESSICA AND BRAIDED IN THE IMMEDIATE AFTERMATH WHEN THEY BOTH WERE REUNITED. THIS GOING BACK IN HALLWAY WHERE IT HAPPENED. IT JUST GONNA. >> LIKE THE MEMORIES OF WHAT HAPPENED TUESDAY. >> IT'S ABOUT WALKER WAS IN GYM CLASS WHEN THE SHOOTING HAPPENED. WE WERE IN THE GYM RIGHT NEXT TO AN OPEN GLASS DOOR. >> IF YOU THINK THERE WASN'T ENOUGH SECURITY. >> IN THE PLACE I WAS PROBABLY I TOOK PARENTS CONCERNS PS OFFICIALS. LISA BACK AS THE STUDENT AND COMMUNITY SERVICES CHIEF OFFICER AT O P S SHE SAYS O P S IS WORKING WITH LAW ENFORCEMENT TO REVIEW THE SHOOTING AND WE'LL MAKE A DETERMINATION ON WHETHER TO ADD OR CHANGE ANY EXISTING SAFETY MEASURES. WE PRACTICE OUR STANDARD RESPONSE PROTOCOL ALL THE TIME IN THE DISTRICT AND THE SCHOOL STAFF IT AT NORTHWEST HAD JUST PRACTICE. >> AND REVIEW THAT INFORMATION THE DAY BEFORE THAT STANDARD RESPONSE PROTOCOL INCLUDES LOCKDOWN DRILLS, BACKS AS OTHER MEASURES ARE IN PLACE LIKE ADDING MORE SECURITY GUARDS TO SCHOOLS, EMERGENCY PHONE LINES THAT WILL CONNECT WITH LAW ENFORCEMENT AND UPDATING DOORS TO THEM. SECURE. I ASKED HER BACK ABOUT THE USE OF METAL DETECTORS. SHE TOLD ME THIS YEAR ALL SECONDARY SCHOOLS PS HAVE METAL DETECTOR WANDS THAT CAN BE USED AS PART OF A SAFETY PLAN. IF THE SCHOOL DEEMS A STUDENT TO BE A THREAT. BUT AS THEY SEND THEIR CHILDREN BACK TO CLASS PARENTS WANT TO KNOW THEY'LL COME HOME SAFE. THEY SHOULD TAKE. >> ARE YOU KEEPING ME? SO THE SAFER WE SENT HIM FOR 7, 8 HOURS A DAY. >> I ASKED O P S AND OPD ABOUT AN INCREASED SECURITY PRESENCE. OFFICIALS TOLD ME WAS AN INCREASED