The Police Department, in cooperation with the School Department, recently conducted an unannounced drug search at Tewksbury Memorial High School. Tewksbury Police’s K-9 unit, joined by K-9 units from five other communities and the Middlesex Sheriff’s Department and working with high school administrators, conducted searches inside and outside the school. As a result of the search, carried out the morning of Feb. 12, officers identified four students who were in possession of small amounts of marijuana. The marijuana was found in the vehicles of three of the students and in the book bag of the fourth. In each case, the amount seized was less than an ounce. Each student was issued a civil citation for $100. The Police Department “continues to take a zero-tolerance stand on any illegal drugs found in our community,” the department said in a prepared statement.