Susan Silva, Westec Security's director of administration, testified as a prosecution witness on Day 48 and underwent direct examination, cross-examination, and redirect examination. She said she had worked for Westec for six years after approximately seven years with APR Alarm Systems and described herself as knowledgeable, though not an expert, about Westec-installed security systems. Silva also confirmed that she had visited the house at 360 North Rockingham; her appearance occurred on a day that also included defense disputes over evidence disclosure, including a videotape of Rockingham.