Andrey Brown was working at home on a quiet August day in 2008 that stopped being quiet with little notice.

He lives on a quiet street in the Ashmont section of Dorchester, selling cable television packages as a subcontractor. His wife was at work at a downtown law firm, and his two kids were at school. He was upstairs when he heard a commotion downstairs.

First he thought he heard the mailman. Then he thought it was a break-in. Instead, he found himself face-to-face with two Boston police officers – Charles Kelley and Antonio DiMaggio – with no idea what they were doing in his house.

“I asked what they were doing in my house,’’ Brown said recently. “And Kelley asked, ‘Are we being recorded?’ That’s when I knew he was up to no good.’’