LAST EDITED ON Jan-31-04 AT 06:43 PM (EST)
 
Yes, the offender seemed to be knowledgeable and interested in security measures. Also, something I learned, is that a "broken" window will not make the alarm go off,,,only opening an armed window or door will.

So, perhaps the night of the party, the killer inspected the doors and windows with the intention of entering by breaking a window but found there was one already broken,,,less risk for the perp.