It worked for North Central Charter Essential School in Massachusetts. This past Monday, a janitor discovered a comb threat inside a boys’ bathroom stall. Police used a video from a surveillance camera set up in front of the bathroom to narrow down the number of suspects. The video showed 33 students used the bathroom during the period when the threat was believed to have been made. All except the suspect used the bathroom for three minutes or less. He was in the bathroom for more than nine minutes. Handwriting samples from the suspect’s locker were also obtained and compared with the writing in the bathroom stall. Police said the samples and the writing in the stall were similar. Police said the suspect admitted to writing the threat and other Magic Marker vandalism in the bathroom, according to a local newspaper report of the incident.

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