>Unless the basement windows were armed, an intruder could
>easily enter and exit and the alarm would not be activated.
>They may only have had the doors armed.

That depends on the type of alarm system in place. In my house, I have only the doors armed. However, I also have motion detectors that will detect movement of anyone entering through my basement or first floor windows.

From reading Smit's theory, I think he believes the intruder selected the basement window because he saw that it did not have a sticker on it indicating that it was alarm protected. If that is the case, the intruder either: (1) knew that Ramsey's alarm system was not activated or did not incorporate motion detectors; or(2) disregarded the risk of setting off the security alarm, and was just plain lucky that the system was not activated by the Ramseys.