Marat Sedenkov wasn’t at the Fourth of July parade in Highland Park, Ill., but when word of the shooting rampage reached him that morning, a thought immediately came to mind: Did any of the security cameras that his company has installed in the downtown neighborhood capture evidentiary video?

Sedenkov, founder and CEO of LaMarco Systems, a life safety and integrated security solutions provider, would receive confirmation later in the day. His phone rang. On the other end was Hal Emalfarb, part owner of Studio ONE, a hospitality venue for live music and social events, and a LaMarco Systems customer.