I'm not sure how accurate spotcrime.com is, but assuming they have access to any public records of shootings, you have to go back to November of 2010 to find one in Somerville. Googling for "shooting somerville ma" the most recent one I find is 2007. This isn't saying that the police are doing a lot of shooting either. Here we prefer our arsons to our guns, apparently.

To my mind even using an police administrator to open a cardboard box containing one of these things would already be a waste of public resources. Use the time that would be spent installing and monitoring them to find the Summer Arsonist, that would be good for everyone.