Fear not, Dookies: That blaring siren you may hear this month is only a test.

Duke this summer is joining a number of universities installing outdoor alarm and alert systems to use in case of campus emergency - a response to last year's massacre at Virginia Tech. 

The university has been installing the systems in recent months and will be testing them in July. Aaron Graves, Duke's security chief, told me this week the specific times of the tests aren't yet known, but will be done throughout the month.