Edited sentence: However, the results are usually slim, since it is widely known that the drug users of the school keep their materials on their bodies.Over the past decade or so, the Tewksbury Police have had to step in and perform regular searches of the facilities using specially trained K-9's.Tewksbury Memorial High School has been the scene of what is considered to be reather frequent drug usage and selling.This is rather convenient since the police typically only search the hallways, and students are required to return to their homerooms for the duration of the search