Student lockers are locked. Seldom is there any accurate record of the combinations because students change lockers at will. Students seem to have an inexhaustible supply of all these things. Have the school authorities or police cut off the locks, then search teams should open the lockers. If you cut off the lock you may end up paying for it.
Chemistry labs have to be treated with caution and respect.
Often some student tries to make rocket fuel or an explosive mixture, gets scared halfway through the project and phones in a bomb call. The best procedure is to get the chemistry teacher to accompany the search team and inspect all chemistry classrooms, labs and storage areas. When repeated bomb threats are received at area schools, a school board may opt to hold make-up classes on Saturdays. That generally tends to cut down the incidence of threats and often leads students to turn in their dial-happy cohorts. Almost every problem that can be imagined when dealing with office buildings, auditoriums and schools is compounded when an airport terminal must be searched.