Janesville police dogs sniff lockers at Franklin Middle School
Students were locked in their classrooms, but classes continued as usual during the 23-minute search, Sheryl Miller, district spokeswoman, said.
The dogs “hit” on 23 lockers, but subsequent searches turned up nothing, Miller said.
Dog searches at Marshall and Edison middle schools April 2 yielded similar results.
All three middle schools have undergone dog searches twice this school year. The high schools were last swept last fall.