Clues (3)

In the late afternoon, many medical personnel enter each of the respective rooms and ask for the sample in order to run the drug test. Everyone was appalled but nobody put up a fight. 

The students who were staying inside their classroom gossiped around. The police took their time in notifying the parents about the case that happened in the school and the precautionary measure of them taking samples from the students. 

Many parents objected. But in the end, they were convinced by the police. If your child is innocent then there's nothing to worry. 

When the school hours is about to be over, the police escorted the students out of the school premises. Each classroom in the corridors exited in a well disciplined manner. The class of Lucien's, Keith's and Stella's were also sent home as well.